Method and apparatus for transreceiving broadcast signal for panorama service

ABSTRACT

The present invention relates to a providing a method and/or an apparatus for transceiving a broadcast signal for a panorama broadcast service. The method for transmitting a broadcast signal, according to one embodiment of the present invention, comprises the steps of: encoding an image, multiplexing into a single broadcast stream, the encoded image and signaling information related to the image, wherein the signaling information includes signaling information related to a panoramic image; generating a broadcast signal including the multiplex broadcast stream; and transmitting the generated broadcast signal.

TECHNICAL FIELD

The present invention relates to transmission and reception of abroadcast signal. More specifically, the present invention relates to amethod and/or an apparatus for transmitting/receiving a broadcast signalfor a panorama service.

BACKGROUND ART

With the development of digital technology and communication technology,demand for audio and video multimedia content has rapidly expanded invarious fields such as broadcasting, movies, Internet and personalmedia. Furthermore, as 3DTV/3D movies that provide 3D broadcast andmovies are popularized, consumer demand for immersive media providingreality and presence increases. In addition, demand for realisticcontent with high quality above HD increases as home TV screens areenlarged and display technology is developed. Accordingly, realisticbroadcasting such as ultra high definition TV (UHDTV) in addition to3DTV receives attention as a future broadcast service for the post-HDTVmarket. Particularly, ultra high definition (UHD) broadcast services areunder active discussion.

Since the advent of 3D and UHD content, demand for panoramic images isincreasing through exhibition halls, newsrooms and outdoor structures. Ahigh-quality panorama service provides a wider viewing angle than the HDvideo service in addition to presence of 3D content and realism of UHDcontent to provide maximized presence to users. In spite of such trend,however, standards for acquisition, generation and reproduction ofpanoramic images do not exist and only a few domestic and foreignresearch institutes perform technology development.

To view a panoramic image using a DTV receiver, the panoramic image isresized to a small image. Accordingly, to show a panoramic image in theoriginal state, there is a need for research on technology fordisplaying a panoramic image having an arbitrary size without distortingthe panoramic image using existing DTV.

DISCLOSURE Technical Problem

An object of the present invention devised to solve the problem lies inprovision of a panoramic image in the original state at production timeto a viewer.

Another object of the present invention is to provide a method ofdividing a panoramic image into one or more images and transmitting theimages.

Yet another object of the present invention is to provide a method ofseparating a panoramic image in a display and displaying the separatedimages.

Still another object of the present invention is to provide an efficientsignaling method for providing a panorama service.

Technical Solution

A method of transmitting a broadcast signal according to an embodimentof the present invention includes: encoding an image; multiplexing theencoded image and signaling information about the image into a singlebroadcast stream, wherein the signaling information includes signalinginformation about a panoramic image; generating a broadcast signalincluding the multiplexed broadcast stream; and transmitting thegenerated broadcast signal.

The signaling information about the image may include event connectioninformation indicating information about a panorama broadcast servicecorresponding to a currently viewed broadcast service, and the signalinginformation about the panoramic image may include panorama compositioninformation indicating a composition of the panoramic image.

The encoding may include dividing the image into one or more images andrespectively encoding the divided images.

The encoding may include encoding additional information on a region ofinterest (ROI) of a user in the image, for providing a high-definitionimage of the ROI, and the multiplexing may include multiplexing theencoded image, the signaling information about the image and the encodedROI additional information into a single broadcast stream.

The panorama composition information may include information about thedivided images.

The panorama composition information may include filtering informationfor removing blocking artifacts from the divided images.

The panorama composition information may include information forcropping the panoramic image into one or more images.

The panorama composition information may include information about theimage of the ROI.

A method of receiving a broadcast signal according to another embodimentof the present invention includes: receiving a broadcast streamincluding a stream with respect to an image and signaling informationabout the image, wherein the signaling information includes signalinginformation about a panoramic image; extracting the stream with respectto the image and the signaling information about the image from thereceived broadcast stream; and decoding the extracted stream withrespect to the image using the extracted signaling information.

The signaling information about the image may include event connectioninformation indicating information about a panorama broadcast servicecorresponding to a currently viewed broadcast service, and the signalinginformation about the panoramic image may include panorama compositioninformation indicating a composition of the panoramic image.

The image may be divided into one or more images and the stream withrespect to the image may include streams with respect to the one or moredivided images, wherein the decoding comprises respectively decoding thestreams with respect to the divided images using the extracted signalinginformation.

The broadcast stream may include a stream with respect to additionalinformation on an ROI of a user in the image, for providing ahigh-definition image of the ROI, wherein the extracting includesextracting the stream with respect to the image, the stream with respectto the ROI additional information and the signaling information aboutthe image from the received broadcast stream, and the decoding includesdecoding the extracted stream with respect to the image and theextracted stream with respect to the ROI additional information usingthe extracted signaling information.

The panorama composition information may include information about thedivided images.

The panorama composition information may include filtering informationfor removing blocking artifacts from the divided images.

The panorama composition information may include information forcropping the panoramic image into one or more images.

The panorama composition information may include information about theimage of the ROI.

The method may further include displaying the decoded stream withrespect to the image, wherein the displaying comprises displaying aregion shifted according to a scrolling request when the scrollingrequest is received from a user.

An apparatus for transmitting a broadcast signal according to anotherembodiment of the present invention includes: an encoder for encoding animage; a multiplexer for multiplexing the encoded image and signalinginformation about the image into a single broadcast stream, wherein thesignaling information includes signaling information about a panoramicimage; a broadcast signal generator for generating a broadcast signalincluding the multiplexed broadcast stream; and a transmitter fortransmitting the generated broadcast signal.

An apparatus for receiving a broadcast signal according to anotherembodiment of the present invention includes: a receiver for receiving abroadcast stream including a stream with respect to an image andsignaling information about the image, wherein the signaling informationincludes signaling information about a panoramic image; a demultiplexerfor extracting the stream with respect to the image and the signalinginformation about the image from the received broadcast stream; and adecoder for decoding the extracted stream with respect to the imageusing the extracted signaling information.

Advantageous Effects

According to the present invention, a panoramic image in the originalstate at production time may be provided to a viewer.

According to the present invention, a method of dividing a panoramicimage into one or more images and transmitting the images may beprovided.

According to the present invention, a method of separating a panoramicimage in a display and displaying the separated images may be provided.

According to the present invention, an efficient signaling method forproviding a panorama service may be provided.

DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a broadcast signal transmission methodaccording to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the composition of scenario 1 accordingto an embodiment of the present invention.

FIG. 3 is a diagram illustrating the composition of scenario 2 accordingto an embodiment of the present invention.

FIG. 4 is a diagram illustrating the composition of scenario 3 accordingto an embodiment of the present invention.

FIG. 5 is a diagram illustrating the composition of scenario 4 accordingto an embodiment of the present invention.

FIG. 6 is a diagram illustrating a method of dividing a panoramic imageaccording to an embodiment of the present invention.

FIG. 7 is a diagram illustrating a panorama service composition ofscenario 1 according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating a panorama service composition ofscenario 2 according to an embodiment of the present invention.

FIG. 9 is a diagram illustrating operations of a plurality of receiversaccording to scrolling when the receivers decode streams generated byencoding divided panoramic images based on scenario 1 according to anembodiment of the present invention.

FIG. 10 is a diagram illustrating an operation of a receiver accordingto scrolling when the receiver decodes streams generated by encodingdivided panoramic images based on scenario 1 according to an embodimentof the present invention.

FIG. 11 is a diagram illustrating arrangement of a panoramic imageaccording to scrolling request when a plurality of receivers having thesame display size display the panoramic image according to an embodimentof the present invention.

FIG. 12 is a diagram illustrating arrangement of a panoramic imageaccording to scrolling request using scaling when a plurality ofreceivers having different display sizes display the panoramic imageaccording to an embodiment of the present invention.

FIG. 13 is a diagram illustrating arrangement of a panoramic imageaccording to scrolling request using cropping when a plurality ofreceivers having different display sizes display the panoramic imageaccording to an embodiment of the present invention.

FIG. 14 is a diagram illustrating operations of two receivers when thereceivers display a panoramic image according to an embodiment of thepresent invention.

FIG. 15 is a diagram illustrating an operation of a receiver when thereceiver receives a panoramic image encoded into one stream based onscenario 2 according to an embodiment of the present invention.

FIG. 16 is a diagram illustrating a panorama service composition basedon scenario 4 according to an embodiment of the present invention.

FIG. 17 is a diagram illustrating the composition ofpanorama_composition_info according to an embodiment of the presentinvention.

FIG. 18 is a diagram illustrating a composition of panorama_service_typeaccording to an embodiment of the present invention.

FIG. 19 is a diagram illustrating a composition ofpanorama_composition_metadata( ) according to an embodiment of thepresent invention.

FIG. 20 is a diagram illustrating a composition of sub_video_afd_bar ( )according to an embodiment of the present invention.

FIG. 21 is a diagram illustrating a method of displaying a partial imagehaving high panorama_view_priority from among partial images forming apanoramic image according to an embodiment of the present invention.

FIG. 22 is a diagram illustrating a composition ofpanorama_filtering_metadata( ) according to an embodiment of the presentinvention.

FIG. 23 is a diagram illustrating the composition ofextraction_info_metadata( ) according to an embodiment of the presentinvention.

FIG. 24 is a diagram illustrating a composition of one video streambased on scenario 2 according to an embodiment of the present invention.

FIG. 25 is a diagram illustrating a composition of ROI_info_metadata( )according to an embodiment of the present invention.

FIG. 26 is a diagram illustrating a composition of a service descriptiontable (SDT) according to an embodiment of the present invention.

FIG. 27 is a diagram illustrating a composition of an event informationtable (EIT) according to an embodiment of the present invention.

FIG. 28 is a diagram illustrating a composition of linkage_descriptor( )included in the EIT according to an embodiment of the present invention.

FIG. 29 is a diagram illustrating type of a target service according tolink_type when linkage_type is 0x0E according to an embodiment of thepresent invention.

FIG. 30 is a diagram illustrating a composition ofadvanced_event_linkage_info( ) according to an embodiment of the presentinvention.

FIG. 31 is a diagram illustrating a composition of a program map table(PMT) and the position of panorama_composition_info( ) included in thePMT according to an embodiment of the present invention.

FIG. 32 is a diagram illustrating a composition of a terrestrial virtualchannel table (TVCT) according to an embodiment of the presentinvention.

FIG. 33 is a diagram illustrating a composition of a cable virtualchannel table (CVCT) according to an embodiment of the presentinvention.

FIG. 34 is a diagram illustrating a composition of service_type for apanorama service according to an embodiment of the present invention.

FIG. 35 is a diagram illustrating a composition ofcomponent_list_descriptor( ) according to an embodiment of the presentinvention.

FIG. 36 is a diagram illustrating a composition of stream_info_details() when stream_type indicates a base stream according to an embodiment ofthe present invention.

FIG. 37 is a diagram illustrating a composition of stream_info_details() when stream_type indicates a stream other than the base streamaccording to an embodiment of the present invention.

FIG. 38 is a diagram illustrating receiver operation when a mainreceiver decodes all streams and delivers the decoded streams to asub-receiver in scenario 1 according to an embodiment of the presentinvention.

FIG. 39 is a diagram illustrating receiver operation when streamsseparated and allocated in each receiver are decoded in scenario 1according to an embodiment of the present invention.

FIG. 40 is a diagram illustrating receiver operation based on scenario 2according to an embodiment of the present invention.

FIG. 41 is a diagram illustrating receiver operation when a mainreceiver decodes all streams and delivers the decoded streams to asub-receiver in scenario 4 according to an embodiment of the presentinvention.

FIG. 42 is a diagram illustrating a broadcast signal reception methodaccording to an embodiment of the present invention.

FIG. 43 is a diagram illustrating a configuration of a broadcast signaltransmission apparatus according to an embodiment of the presentinvention.

FIG. 44 is a diagram illustrating a configuration of a broadcast signalreception apparatus according to an embodiment of the present invention.

BEST MODE

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. However, the invention should not be limited to the specificembodiments described herein.

Although the terms used in the present invention are selected fromgenerally known and used terms, some of the terms mentioned in thedescription of the present invention are selected by the applicant athis or her discretion, the detailed meanings of which are described inrelevant parts of the description herein. Furthermore, it is requiredthat the present invention is understood, not simply by the actual termsbut by the meanings of each term lying within.

FIG. 1 is a diagram illustrating a broadcast signal transmission methodaccording to an embodiment of the present invention.

The broadcast signal transmission method according to an embodiment ofthe present invention may perform the following process.

An encoder according to an embodiment of the present invention mayencode an image (S1010). A multiplexer according to an embodiment of thepresent invention may multiplex the encoded image and/or signalinginformation related to the image into one broadcast stream (S1020).Here, the signaling information may include signaling information abouta panoramic image. A broadcast signal generator according to anembodiment of the present invention may generate a broadcast signalincluding the multiplexed broadcast stream (S1030). A transmitteraccording to an embodiment of the present invention may transmit thegenerated broadcast signal (S1040). Here, the transmitter may transmitthe broadcast signal through a terrestrial broadcast network, theInternet and/or a cable network.

According to another embodiment of the present invention, the signalinginformation related to the image may include event connectioninformation that indicates information about a panorama broadcastservice corresponding to a currently viewed broadcast service, and thesignaling information about the panoramic image may include panoramacomposition information that indicates the composition of the panoramicimage. Here, the event connection information may refer toadvanced_event_linkage_info. The panorama composition information mayrefer to panorama_composition_info. A detailed description thereof willbe given later with reference to FIGS. 17 and 30.

According to another embodiment of the present invention, the encodermay divide the image into one or more images and respectively encode thedivided images. Here, the image may include a panoramic image. Adetailed description thereof will be given later with reference to FIGS.2, 6 and 7.

According to another embodiment of the present invention, the encodermay encode additional information about an ROI (Region of Interest) forproviding a high-quality image for an ROI of a user in the image, andthe multiplexer may multiplex the encoded image, the signalinginformation related to the image and/or the encoded additionalinformation about the ROI into one broadcast stream. Here, theadditional information about the ROI may refer to ROI enhancement data.A detailed description thereof will be given later with reference toFIGS. 5, 16 and 41.

According to another embodiment of the present invention, the panoramacomposition information may include information about the dividedimages. Here, the information about the divided images may refer topanorama_composition_metadata. A detailed description thereof will begiven later with reference to FIGS. 17, 19 and 20.

According to another embodiment of the present invention, the panoramacomposition information may include filtering information for removingblocking artifacts from the divided images. Here, the filteringinformation for blocking artifact removal may refer topanorama_filtering_metadata. A detailed description thereof will begiven later with reference to FIGS. 17, 19 and 22.

According to another embodiment of the present invention, the panoramacomposition information may include information for cropping thepanoramic image into one or more images. Here, the information forcropping the panoramic image may refer to extraction_info_metadata. Adetailed description thereof will be given later with reference to FIGS.3, 8, 17, 23 and 38.

According to another embodiment of the present invention, the panoramacomposition information may include information about an image of theROI. Here, the information about the image of the ROI may refer toROI_info_metadata. A detailed description thereof will be given laterwith reference to FIGS. 17, 25 and 41.

An embodiment of the present invention may provide an efficient displaymethod for maximizing advantages of a panoramic image. For example, anembodiment of the present invention may provide a method of receivingonly an ROI using an existing receiver, a method of efficientlydisplaying a panoramic image having an arbitrary size using a pluralityof existing receivers and a method of allowing a user to view an areaother than an area in which a receiver can display an image throughscrolling.

An embodiment of the present invention may divide a panoramic image intoimages having a specific size, respectively encode the images, deliverthe encoded images to a plurality of receivers and allow the receiversto output parts of the panoramic image corresponding thereto. Inaddition, an embodiment of the present invention may allow one existingDTV receiver to display part of a panoramic image by signaling priorityof the part of the panoramic image (scenario 1). That is, scenario 1 maygenerate one stream composed of divided panoramic images.

Another embodiment of the present invention may signal a panoramic imageand coordinate values for dividing the panoramic image such that a mainreceiver delivers cropped images to a plurality of sub-DTV receivers. Inaddition, an embodiment of the present invention may allow all receiversto decode the entire panoramic image and to output parts of thepanoramic image, which respectively correspond to the receivers.Furthermore, an embodiment of the present invention may allow a croppedimage to be viewed even through one existing DTV receiver (scenario 2).That is, scenario 2 may compose a panoramic image as one stream.

Another embodiment of the present invention may display a default regionand then display an image shifted by a scrolling request from a userupon reception of the scrolling request. When multiple 16:9 DTVreceivers divide a panoramic image and output the divided images,scrolling may be performed sequentially and automatically in other DTVreceivers (scenario 3). The service according to scenario 3 may beprovided on the basis of scenario 1 and/or scenario 2.

Another embodiment of the present invention may provide enhancement dataof some ROI through an enhancement layer using scalable HEVC (SHVC) andprovide signaling information about the enhancement data in order toprovide a high picture quality service with respect to ROI (scenario 4).

When a viewer views a general broadcast event, another embodiment of thepresent invention may provide a panorama service corresponding to thebroadcast event using a linkage descriptor when the panorama service ispresent (scenario 5).

According to an embodiment of the present invention, even a DTV receiverhaving an aspect ratio of 16:9 may display a panoramic image withoutresizing the same. An embodiment of the present invention may allow onedisplay device to output some ROI included in a panoramic image andallow a plurality of DTV receivers to divide a panoramic image and todisplay the divided images.

According to an embodiment of the present invention, when receiversdisplay a panoramic image using the method of scenario 1 or 2, thepanoramic image may be shifted and selectively displayed upon input of ascrolling request from a user.

According to an embodiment of the present invention, a high-qualityvideo service may be provided without transmission of large-sized data,using a method of transmitting enhancement data regarding ROI.

According to an embodiment of the present invention, a panoramic imageservice and a video service with an aspect ratio of 16:9 may be linked.Here, the video service with 16:9 may provide an image obtained bydividing a panoramic image or may be a conventional 16:9 video service.

FIG. 2 is a diagram illustrating the composition of scenario 1 accordingto an embodiment of the present invention.

According to scenario 1, a panoramic image having an arbitrary size maybe divided into images having a predetermined size, encoded anddelivered to a plurality of receivers such that the receivers outputrelevant parts of the panoramic images. In addition, even a receiverthat cannot output a panoramic image without resizing the same maydisplay a desired part of the panoramic image by numbering parts of thepanoramic image (or designating the parts as a base view).

According to an embodiment of the present invention, divided and encodedstreams may be transmitted to a main receiver, as represented by solidlines in the figure. The main receiver may decode the transmittedstreams and then deliver the decoded streams to sub-receivers.

According to another embodiment of the present invention, streamsencoded for divided images may be transmitted to the sub-receivers andthe main receiver, as represented by dotted lines in the figure. Thesub-receivers and the main receiver may decode the transmitted streamswith respect to the divided images and then display the images.

FIG. 3 is a diagram illustrating the composition of scenario 2.

Scenario 2 according to an embodiment of the present invention maysignal a panoramic image and coordinate values for cropping thepanoramic image. Accordingly, scenario 2 may allow a plurality of DTVreceivers to divide the panoramic image and to output the dividedimages. Scenario 2 may crop a panoramic image and provide the croppedpanoramic image to a user using a conventional DTV receiver. Inaddition, scenario 2 may allow a second device to display a croppedpart.

According to an embodiment of the present invention, one stream encodedwith respect to a panoramic image may be transmitted to a main receiver,as represented by a solid line 3010 in the figure. The main receiver maydecode the transmitted stream and extract part of the panoramic imageusing cropping coordinates. In addition, the main receiver may deliverthe extracted part of the panoramic image to sub-receivers.

According to another embodiment of the present invention, the streamencoded with respect to the panoramic image may be transmitted to allsub-receivers and the main receiver, as represented by dotted lines 3020in the figure. Each receiver may decode the transmitted stream, crop theimage corresponding to the stream using cropping coordinates and displayan image required therefor.

According to another embodiment of the present invention, the streamencoded with respect to the panoramic image may be transmitted to anexisting receiver and/or a second device, as represented by other dottedlines 3030 in the figure. The existing receiver and/or the second devicemay decode the transmitted stream, crop the image corresponding to thestream and display the cropped image.

FIG. 4 is a diagram illustrating the composition of scenario 3 accordingto an embodiment of the present invention.

Scenario 3 according to an embodiment of the present invention may allowa receiver to output part of a panoramic image as a default region and,when a scrolling request is received from a user, to shift coordinatevalues by corresponding scrolling information and to display the region.

A scrolling method according to an embodiment of the present inventionmay depend on the number of receivers that display a panoramic image orthe number of encoded streams.

FIG. 5 is a diagram illustrating the composition of scenario 4 accordingto an embodiment of the present invention.

Scenario 4 according to an embodiment of the present invention mayprovide high picture quality zoom-in and zoom-out functions for ROI. Tothis end, scenario 4 may provide enhancement data about part of apanoramic image using an enhancement layer of SHVC and provide signalinginformation about the enhancement data.

Referring to the figure, a panoramic image may be encoded (by an HEVCencoder) into a stream of a base layer or an enhancement layer andtransmitted. A receiver may decode the encoded stream (by an HEVCdecoder) and display an image corresponding to the stream Enhancementdata regarding ROI may be encoded (by an SHVC encoder) into a stream ofan enhancement layer and transmitted. The receiver may decode theencoded stream (by an SHVC decoder) and display an image correspondingto the stream. Here, the receiver may crop the ROI of the receivedpanoramic image using information about the ROI (ROI_start_x,ROI_start_y, ROI_width and/or ROI_height) and provide a high-qualityimage with respect to the ROI using the received enhancement data. Here,SHVC is short for scalable HEVC and may correspond to scalable codecbased on HEVC. Accordingly, SHVC includes HEVC and encodes and/ordecodes an enhancement layer stream to provide scalability. Theenhancement layer may correspond to a layer including a stream havingresidual data except information included in HEVC streams of the baselayer.

When a viewer views a general broadcast event, scenario 5 according toanother embodiment of the present invention may provide a panoramaservice corresponding to the event using the linkage descriptor when thepanorama service is present. Here, the event may refer to a broadcastprogram.

FIG. 6 is a diagram illustrating a method of dividing a panoramic imageaccording to an embodiment of the present invention.

According to an embodiment of the present invention, the panoramic imagemay be divided into left, center and right regions. As shown in thefigure, the panoramic image may be divided into a plurality of images ina mosaic form.

According to an embodiment of the present invention, the divided imagesmay be signaled as one-dimensional values (6010) or signaled astwo-dimensional coordinate values, as shown in the figure. Here, numberallocation order may vary.

FIG. 7 is a diagram illustrating a panorama service composition ofscenario 1 according to an embodiment of the present invention.

An embodiment of the present invention may divide a panoramic imagehaving an arbitrary size into predetermined areas based on a service(service 1) compatible with the 16:9 format. The divided images may beencoded and transmitted to a plurality of receivers. The receivers maydisplay images corresponding thereto.

To display the entire panoramic image through the receivers, anembodiment of the present invention may provide service 1, service 2,service 3 and/or the panorama service to the receivers using an image7010 corresponding to service 1, an image 7020 corresponding to service2, an image 7030 corresponding to service 3 and/or panorama compositioninformation.

According to an embodiment of the present invention, a video wall and/orsignage, which can display panoramic images, may compose the samepanoramic image as the original panoramic image and display the same.Here, the video wall may refer to a large screen composed by stackingvideo screens. The signage may refer to a large display such as adisplay advertisement board.

According to another embodiment of the present invention, a receiver maydisplay the panoramic image through a DTV receiver with an aspect ratioof 16:9 without resizing the panoramic image. In this case, only animage selected by the user from the divided images 7010, 7020 and 7030may be displayed. In addition, an embodiment of the present inventionmay provide service 1 designated a default service.

FIG. 8 is a diagram illustrating a panorama service composition ofscenario 2 according to an embodiment of the present invention.

An embodiment of the present invention may transmit cropping coordinatevalues for dividing a panoramic image having an arbitrary size to one ormore receivers along with the panoramic image. The receivers may receivethe entire panoramic image, decode the panoramic image and then crop thepanoramic image using the cropping coordinate values.

According to an embodiment of the present invention, when a 16:9receiver displays the panoramic image without resizing the same, thereceiver may select a desired image of the user using extraction infometadata including the cropping coordinate values and display theselected image. Here, the receiver may provide the 16:9 service using acropping coordinate value designated as a default value from among thecropping coordinate values included in the extraction info metadata.Here, the receiver may be a DTV receiver.

According to another embodiment of the present invention, when aplurality of receivers displays the entire panoramic image, thereceivers may divide the panoramic image using the extraction infometadata and display images respectively corresponding to the receivers.Here, the receivers may refer to DTV receivers.

According to another embodiment of the present invention, a video walland/or signage, which can display panoramic images, may display thepanoramic image without regard to the extraction info metadata.

FIG. 9 is a diagram illustrating operations of a plurality of receiversaccording to scrolling when the receivers decode a stream generated byencoding divided panoramic images based on scenario 1 according to anembodiment of the present invention.

According to an embodiment of the present invention, when a scrollingrequest for scrolling a panoramic image composed through scenario 1 or 2by +X on the x-axis and by +Y on the y-axis is received, the receiversmay display an image shifted from the panoramic image by X to the rightand by Y to the top. Here, scenario 3 (receiver operation according toscrolling) according to an embodiment of the present invention mayprovide the service through different methods in a case based onscenario 1 that composes the divided panoramic images as one stream andin a case based on scenario 2 that composes the entire panoramic imageas one stream.

Scenario 3 according to an embodiment of the present invention mayprovide the service through different methods in a case in which aplurality of receivers decodes the stream generated by encoding thedivided panoramic images and in a case in which one receiver decodes thestream generated by encoding the divided panoramic images even whenscenario 3 is based on scenario 1.

The figure illustrates operations of a plurality of receivers accordingto scenario 3 when the receivers decode the stream generated by encodingthe divided panoramic images based on scenario 1.

When the entire panoramic image is divided into multiple images and thedivided images are transmitted through respective streams according toan embodiment of the present invention (scenario 1), the receivers maydecode streams that need to be output by the respective receivers anddisplay images corresponding to the streams. Here, when a receiverreceives a scrolling request from the user, the receiver may separate apart to be scrolled according to the scrolling request, from the imagedecoded thereby, and deliver the part to another receiver or receive anecessary image part from another receiver. In this case, the image partscrolled according to the scrolling request, that is, the necessaryimage part, may be delivered using a method such as Internet protocol(IP), universal plug and play (UPnP) and high definition multimediainterface (HDMI).

According to an embodiment of the present invention, the panoramic imagemay be divided into 6 images, as illustrated in the figure. Here, theleft top image to the right bottom image may be sequentially numberedfrom 1 to 6 for convenience of description. The divided images may betransmitted to a plurality of receivers. For example, images 1 and 2 maybe encoded into streams and delivered to receiver 1. Similarly, images 3and 4 may be delivered to receiver 2 and images 5 and 6 may be deliveredto receiver 3. Here, when a scrolling request is received from the user,a receiver that has received the scrolling request may become a mainreceiver. The main receiver may deliver the scrolling request andsignaling information thereabout to other sub-receivers. For example,when a scrolling request for scrolling from the left to the right isreceived from the user, receiver 1 may insert bar data to a left regionof the receiver thereof, which is generated according to scrolling ofthe image displayed through receiver 1. Referring to the figure, ascrolled part (region A) of the image corresponding to receiver 1 ismoved to a left region (region A′) of receiver 2 and output by receiver2 after being decoded although region A is decoded in receiver 1.Receiver 2 receives the decoded image corresponding to region A fromreceiver 1 and display the image. A right region (region B) of the imagedisplayed through receiver 2 is scrolled according to the scrollingrequest to a left region (region B′) of the display of receiver 3 andoutput by receiver 3 after being decoded in receiver 2. Receiver 3 mayreceive the decoded image corresponding to region B from receiver 2 anddisplay the image. A right region of the image displayed through display3 is scrolled according to the scrolling request and thus may not bedisplayed. According to an embodiment of the present invention, receiver1 may deliver the decoded image corresponding to region A and/orcoordinate information (width and/or height) about region A toreceivers. Similarly, receiver 2 may deliver the decoded imagecorresponding to region B and coordinate information about region B toreceiver 3, as shown in the figure.

FIG. 10 is a diagram illustrating an operation of a receiver accordingto scrolling when the receiver decodes streams generated by encodingdivided panoramic images based on scenario 1 according to an embodimentof the present invention.

This figure illustrates receiver operation according to scenario 3(scrolling) when a plurality of receivers decodes streams generated byencoding divided panoramic images based on scenario 1.

When a panoramic image is divided into a plurality of images and thedivided images are transmitted in the form of respective streams(scenario 1) according to an embodiment of the present invention, themain receiver may receive and decode all streams and deliver all decodedimages to sub-receivers. That is, since the present embodiment describesa method through which the main receiver decodes all images, composesthe entire panoramic image and delivers, to the sub-receivers, images tobe displayed through the sub-receivers, the method according to thepresent embodiment may be the same as the method through which the mainreceiver decodes the entire panoramic image and delivers the same to aplurality of receivers in scenario 2 (cropping).

The sub-receivers may receive images to be output therethrough from themain receiver and display the images. Here, when a scrolling request isreceived from the user, the main receiver may scroll the decodedpanoramic image in response to the scrolling request and deliver, to thesub-receivers, decoded images to be output by the sub-receivers, using amethod such as IP, UPnP and HDMI.

According to an embodiment of the present invention, the panoramic imagemay be divided into 6 images, as illustrated in the figure. Here, theleft top image to the right bottom image may be sequentially numberedfrom 1 to 6 for convenience of description. The divided images may berespectively encoded into streams and delivered to one receiver. Forexample, the divided images 1 to 6 may be respectively encoded intostreams and all the encoded streams may be delivered to receiver 2. Whena scrolling request is received from the user, a receiver that hasreceived the scrolling request may become a main receiver. The mainreceiver may deliver the scrolling request and signaling informationthereon to other sub-receivers. For example, if a scrolling request forscrolling from the left to the right is received from the user, imagesto be displayed through the respective receivers, in the entirepanoramic image, may be changed, and thus the main receiver may decodethe entire panoramic image, subdivide the images to be displayed throughthe respective receivers and deliver the same to the sub-receivers.Here, receiver 1 may insert bar data into a left region generatedaccording to scrolling of the image displayed through receiver 1 and aright part of the image displayed through receiver 3, which is scrolledaccording to the scrolling request, may not be displayed.

FIG. 11 is a diagram illustrating arrangement of a panoramic imageaccording to a scrolling request when a plurality of receivers havingthe same display size displays the panoramic image according to anembodiment of the present invention.

A main receiver (main display) according to an embodiment of the presentinvention may decode a stream transmitted thereto irrespective of thescrolling request. Then, when a scrolling request for scrolling theimage by +X on the x-axis and +Y on the y-axis is received, the mainreceiver may display an image having the same width and height as thedisplay thereof in a display area starting from a point shifted from thepoint (0, 0) by +X on the x-axis and +Y on the y-axis. For example, thefigure illustrates arrangement of the panoramic image when the panoramicimage is scrolled by 700 along the x-axis (to the left) and 0 along they-axis.

According to an embodiment of the present invention, when there areimages to be displayed by the main receiver or other sub-receiversalthough decoded by sub-receivers (sub-display 1 and sub-display 2), thesub-receivers that have decoded the images may deliver the decodedimages to the main receiver or other sub-receivers that will display theimages. Similarly, when there are images to be displayed bysub-receivers although decoded by the main receiver, the main decoderthat has decoded the images may deliver the decoded images to thesub-receivers that will display the images.

The sub-receivers (sub-display 1 and sub-display 2) according to anembodiment of the present invention may receive a scrolling request ofthe user from the main receiver. The sub-receivers may decode receivedstreams irrespective of the scrolling request. Then, when a scrollingrequest for scrolling the image by +X on the x-axis and +Y on the y-axisis received, the main receiver may display an image having the samewidth and height as the display thereof in a display area starting froma point shifted from the point (0, 0) by +X on the x-axis and +Y on they-axis. When blanks are generated in the display screens of thesub-receivers due to scrolling, the sub-receivers may insert bar datainto the blanks based on display resolution and scrolling informationthereof. Here, a letterbox and/or a pillar box may be inserted as thebar data or the letter box and the pillar box may be combined andinserted.

When there is an image that has not been decoded by a sub-receiveraccording to an embodiment of the present invention but needs to bedisplayed by the sub-receiver, the sub-receiver may receive the decodedimage from the main receiver or other sub-receivers.

FIG. 12 is a diagram illustrating arrangement of a panoramic imageaccording to a scrolling request using scaling when a plurality ofreceivers having different display sizes displays the panoramic imageaccording to an embodiment of the present invention.

Distinguished from the aforementioned case in which a plurality ofreceivers having the same display size displays a panoramic image,scaling down and/or scaling up may be performed since the receivers havedifferent display sizes in the present embodiment. According to anembodiment of the present invention, a main receiver and a sub-receivermay exchange information about screen sizes and/or display resolutionsand positions at which receivers are connected may be set, like a casein which a multi-monitor is used in order to use a plurality ofreceivers.

A main receiver and a sub-receiver according to an embodiment of thepresent invention may exchange information about screen sizes and/ordisplay resolutions thereof. Such information exchange may be performedonly when initially executed. According to an embodiment of the presentinvention, a receiver to which the user has sent a scrolling requestbecomes the main receiver and the main receiver may deliver scrollingrelated information to all sub-receivers.

The main receiver (main display) according to an embodiment of thepresent invention may decode streams transmitted thereto irrespective ofthe scrolling request. Then, when a scrolling request for scrolling theimage by +X on the x-axis and +Y on the y-axis is received, the mainreceiver may display an image having the same width and height as thedisplay thereof in a display area starting from a point shifted from thepoint (0, 0) by +X on the x-axis and +Y on the y-axis. For example, thefigure illustrates arrangement of the panoramic image when the panoramicimage is scrolled by 700 along the x-axis (to the left) and 0 along they-axis.

When the main receiver according to an embodiment of the presentinvention has a larger display size than other sub-receivers, imagessent from the main receiver to the sub-receivers may be scaled downbased on the display resolutions and/or screen sizes of thesub-receivers and delivered to the sub-receivers (12010). Conversely,images sent from the sub-receivers to the main receiver may be scaled upbased on the display resolution and/or screen size of the main receiverand delivered to the main receiver (12020).

Sub-receivers (sub-display 1 and sub-display 2) according to anembodiment of the present invention may receive a scrolling request ofthe user from the main receiver. The sub-receivers may decode receivedstreams irrespective of the scrolling request. Then, when a scrollingrequest for scrolling the image by +X on the x-axis and +Y on the y-axisis received, the main receiver may display an image having the samewidth and height as the display thereof in a display area starting froma point shifted from the point (0, 0) by +X on the x-axis and +Y on they-axis. When blanks are generated in the display screens of thesub-receivers due to scrolling, the sub-receivers may insert bar datainto the blanks based on display resolution and scrolling informationthereof. Here, a letterbox and/or a pillar box may be inserted as thebar data or the letter box and the pillar box may be combined andinserted.

FIG. 13 is a diagram illustrating arrangement of a panoramic imageaccording to a scrolling request using cropping when a plurality ofreceivers having different display sizes displays the panoramic imageaccording to an embodiment of the present invention.

Distinguished from the aforementioned panoramic image arrangementaccording to a scrolling request using scaling, decoded images may becropped to be adapted to display sizes without being scaled and assignedto respective receivers in another embodiment of the present invention.

Sub-receivers (sub-display 1 and sub-display 2) according to anembodiment of the present invention may receive segmented streams,decode the received streams and crop the images corresponding to thestreams to be suited to the display sizes thereof using displayresolutions thereof, coordinates values of positions at which receiversare connected, display sizes of the receivers and/or scrollinginformation.

Upon reception of a scrolling request from the user, image 1 (13010)displayed through the main receiver may be cropped and discarded usingdisplay resolutions of respective receivers, coordinate values at whichthe receivers are connected, display sizes of the receivers and/orscrolling information. Image 2 (13020) discarded for fitting to thedisplay size of the relevant sub-receiver may be delivered along withimage 3 (13030) to the main receiver without being discarded afterdecoding. For example, the figure illustrates panoramic imagearrangement when the panoramic image is scrolled by 700 along the x-axis(to the left) and 0 along the y-axis.

FIG. 14 is a diagram illustrating operations of two receivers when thereceivers display a panoramic image according to an embodiment of thepresent invention.

According to an embodiment of the present invention, a receiver that hasreceived a scrolling request from the user may be a main receiver andthe other receiver may be a sub-receiver.

According to an embodiment of the present invention, the main receiverand the sub-receiver may exchange target display sizes and/or outputresolution information. Here, the target display sizes may refer todisplay sizes of the main receiver and/or the sub-receiver. The mainreceiver and the sub-receiver may respectively receive streams withrespect to divided panoramic images and decode the received streams.When a scrolling request for scrolling by +X along the x-axis and Yalong the y-axis ((x,y)>(x′,y′)) is input, the main receiver may receivethe scrolling request and deliver scrolling information to thesub-receiver. The main receiver may separate an image with respect tothe stream decoded therein using scrolling information and/or targetdisplay information and deliver the same to the sub-receiver. Similarly,the sub-receiver may separate an image with respect to the streamdecoded therein using the scrolling information and/or target displayinformation and deliver the same to the main receiver. Here, the targetdisplay information may include target display size and/or displayresolution information. The method of separating an image with respectto a decoded stream may include the aforementioned scaling and/orcropping methods.

FIG. 15 is a diagram illustrating receiver operation according toscrolling when a receiver receives a panoramic image encoded into onestream on the basis of scenario 2 according to an embodiment of thepresent invention.

In scenario 2 according to an embodiment of the present invention, apanoramic image may be encoded into one stream and the panoramic imagemay be divided into a plurality of images using cropping coordinates.

According to scenario 2, one receiver may decode the stream with respectto the entire panoramic image, divide the panoramic image using croppingcoordinates and deliver the divided images to other receivers (scenario21). Alternatively, all receivers may decode the stream with respect tothe entire panoramic image and then output only parts to be displayedthereby using cropping coordinates (scenario 22).

In the case of scenario 21, when a scrolling request is input by theuser, cropping coordinate values may be moved at the scrolling requestof the user in an embodiment of the present invention ((x,y)>(x′,y′)).Then, the panoramic image may be cropped based on the croppingcoordinate values. A main receiver may deliver cropped and dividedimages to sub-receivers. The sub-receivers may display the dividedimages delivered thereto.

In the case of scenario 22, when a scrolling request is input by theuser, a main receiver that has received the scrolling request maydeliver scrolling information to other sub-receivers. All receivers maydecode the entire panoramic image. The receivers may move croppingcoordinate values at the scrolling request of the user, crop thepanoramic image based on the cropping coordinate values and displaycropped and divided images.

FIG. 16 is a diagram illustrating a panorama service composition basedon scenario 4 according to an embodiment of the present invention.

Scenario 4 according to an embodiment of the present invention mayprovide enhancement data of a part of a panoramic image through anenhancement layer using SHVC and provide signaling information about theenhancement data in order to provide a high definition service for anROI.

According to an embodiment of the present invention, an ROI in apanoramic image may be designated, and enhancement data added to a baselayer signal is encoded into an enhancement layer signal and transmittedfor the ROI. When the panoramic image is low resolution, enhancementdata may be used to provide a high definition service for the image ofthe ROI. Accordingly, a panorama service including a high-definition ROImay be provided according to an embodiment of the present invention.

Residual data for ROI illustrated in the figure may refer to theenhancement data and include the width, height and start pointcoordinates (x, y) of ROI.

FIG. 17 is a diagram illustrating the composition ofpanorama_composition_info according to an embodiment of the presentinvention.

Panorama_composition_info according to an embodiment of the presentinvention may be transmitted in a supplemental enhancement information(SEI) message. The panorama_composition_info may be referred to aspanorama_composition_information.

The panorama_composition_info according to an embodiment of the presentinvention may include a panorama_service_type field, apanorama_composition_info_ver field, a panorama_width_div32 field, apanorama_height_div32 field, a panorama_profile field, a panorama_levelfield, a panorama_tier field, a panorama_stream_num field, apanorama_view_num field, a panorama_view_priority field, anincluded_stream_id field, a panorama_composition_metadata( ) field, apanorama_filtering_metadata( ) field, a cropping_region_num field, anextraction_info_metadata( ) field, an ROI_num field, an ROI_codec_typefield and/or an ROI_info_metadata( ) field.

The panorama_service_type field may indicate a panorama servicecorresponding to a relevant program. Detailed description thereof willbe given later.

The panorama_composition_info_ver field may indicate the version numberof the panorama_composition_info. According to an embodiment of thepresent invention, when part of data of the panorama_composition_info ischanged, the version number may be increased by “1” to indicate anupdated version.

The panorama_width_div32 field may indicate a width for signaling thesolution of an original panoramic image. The actual width value may be avalue obtained by multiplying the panorama_width_div32 field by 32. Thepanorama_composition_info may include a panorama_aspect_ratio field thatindicates aspect ratio information, which is not illustrated in thefigure.

The panorama_height_div32 field may indicate a height for signaling theresolution of the original panoramic image. The actual height value maybe a value obtained by multiplying the panorama_height_div32 field by32.

The panorama_profile field may indicate profile information about thepanoramic image.

The panorama_level field may indicate level information about thepanoramic image.

The panorama_tier field may indicate tier information about thepanoramic image. Here, the concept of tier may not be used according totype of a codec. When the tier is not used, signaling may be performedas in the case of a main tier.

The panorama_stream_num field may indicate the number of streamscorresponding to divisions of a panoramic image when thepanorama_service_type field is 1.

The panorama_view_num field may indicate the number of receivers towhich divided panoramic images are transmitted when thepanorama_service_type field is 1.

The panorama_view_priority field may indicate priority of divided imageswhen the panorama_service_type field is 1. For example, when only onereceiver is provided, a view (image) of highest priority may be output.

The included_stream_id field may indicate the ID of a divided panoramicimage when the panorama_service_type field is 1. This field may identifyan image displayed through a receiver. According to an embodiment of thepresent invention, a mask bit may be allocated according to the numberof divided streams. For example, when the panorama_view_num field is 10,that is, when a panoramic image is divided into 10 streams, 10 bits maybe allocated to the included_stream_id field.

The panorama_composition_metadata( ) field will be described in detaillater.

The panorama_filtering_metadata( ) field will be described in detaillater.

The cropping_region_num field may indicate the number of croppingcoordinate values for dividing a panoramic image when thepanorama_service_type is 2. The panorama_composition_info may include acropping_flag field that may indicate whether a relevant stream is astream configured to crop the panoramic image into multiple regions.

The extraction_info_metadata( ) field will be described in detail later.

The ROI_num field may indicate the number of regions of interest whenthe panorama_service_type is 4.

The ROI_codec_type field may indicate the type of a used codec.According to an embodiment of the present invention, S(H)SVcorresponding to a scalable codec may be used in order to provide highdynamic range services or color gamut related services for provision ofhigh-definition ROI services. When a temporal scalability service of120p is provided while the existing service is 60p, the service may beprovided using an HEVE(AVC) codec.

The ROI_info_metadata( ) field will be described in detail later.

FIG. 18 is a diagram illustrating a composition of thepanorama_service_type according to an embodiment of the presentinvention.

Referring to the figure, the panorama_service_type may indicateprovision of the service of scenario 1 according to an embodiment of thepresent invention when this type is 001. Scenario 1 may refer to aservice of dividing a panoramic image into forms compatible withexisting receivers. The panorama_service_type may indicate provision ofthe service of scenario 2 when this field is 010. Scenario 2 may referto a service including a whole panoramic image and extractioninformation. The panorama_service_type may indicate provision of theservice of scenario 4 according to an embodiment of the presentinvention when this field is 011. Scenario 4 may refer to a service forproviding a high-definition image with respect to an ROI.

FIG. 19 is a diagram illustrating a composition of thepanorama_composition_metadata( ) according to an embodiment of thepresent.

The panorama_composition_metadata( ) according to an embodiment of thepresent invention may include a sub_video_profile field, asub_video_level field, a sub_video_tier field, a sub_video_aspect_ratiofield, a sub_video_width_div8 field, a sub_video_height_div8 field, asub_video_stream_id field and/or a sub_video_afd_bar ( ) field.

The sub_video_profile field may indicate profile information of adivided video stream. If the profile information of the divided videostream is the same as the stream of a panoramic image, signaling thatthe profile information of the video stream is the same as the stream ofthe panoramic image may replace additional signaling of the profileinformation of the video stream.

The sub_video_level field may indicate level information of a dividedvideo stream. If the level information of the divided video stream isthe same as the stream of a panoramic image, signaling that the levelinformation of the video stream is the same as the stream of thepanoramic image may replace additional signaling of the levelinformation of the video stream.

The sub_video_tier field may indicate tier information of a dividedvideo stream. If the tier information of the divided video stream is thesame as the stream of a panoramic image, signaling that the tierinformation of the video stream is the same as the stream of thepanoramic image may replace additional signaling of the tier informationof the video stream.

The sub_video_aspect_ratio field, the sub_video_width_div8 field and thesub_video_height_div8 field may respectively indicate aspect ratio,width and height information which are resolution information of adivided video stream. According to an embodiment of the presentinvention, the sub_video_aspect_ratio field may not be included in thepanorama_composition_metadata( ) since the aspect ratio information maybe inferred through the resolution information.

The sub_video_stream_id field may identify a divided video stream. Asdescribed above with respect to an image division method, this field mayindicate two-dimensional or one-dimensional coordinate values. When thefield is assigned two-dimensional coordinate values, the assignedtwo-dimensional coordinate values may be mapped to one-dimensionalcoordinate values. When the field is assigned two-dimensional coordinatevalues, an embodiment of the present invention may identify a dividedvideo stream with sub_video_stream_id_x and sub_video_stream_id_y andsignal the same. According to an embodiment of the present invention,the panorama_composition_metadata( ) may include asub_video_view_direction field. The sub_video_view_direction field maybe signaled along with the sub_video_stream_id field. Left, center andright images, from among images obtained by dividing a panoramic image,may be identified and the direction and order thereof may be signaledthrough direction information included in the sub_video_view_directionfield.

The sub_video_afd_bar( ) field will be described in detail later.

FIG. 20 is a diagram illustrating a composition of sub_video_afd_bar( )according to an embodiment of the present invention.

The sub_video_afd_bar ( ) according to an embodiment of the presentinvention may include a sub_video_afd_start_x_div4 field, asub_video_afd_start_y_div4 field, a sub_video_afd_width_div4 fieldand/or a sub_video_afd_height_div4 field.

The sub_video_afd_start_x_div4 field and the sub_video_afd_start_y_div4field may indicate start coordinate values (x, y) of an active formatcorresponding to the sub_video_stream_id.

The sub_video_afd_width_div4 field and the sub_video_afd_height_div4field may respectively indicate the width and height of an active formatstarting at the coordinate values indicated by thesub_video_afd_start_x_div4 field and the sub_video_afd_start_y_div4field. An actual width and height may be obtained by multiplying thevalues indicated by the corresponding fields by 4.

FIG. 21 is a diagram illustrating a method of displaying an image havinghigh panorama_view_priority from among partial images that constitute apanoramic image according to an embodiment of the present invention.

According to an embodiment of the present invention, an image to bedisplayed through a receiver using information included in thepanorama_view_priority field and information included in theincluded_stream_id field. According to an embodiment of the presentinvention, a part of an image to be displayed may be determined usinginformation included in the sub_video_aft_bar( ) field.

FIG. 22 is a diagram illustrating a composition of thepanorama_filtering_metadata( ) according to an embodiment of the presentinvention.

According to an embodiment of the present invention, a filtering processmay be added when divided panorama streams are stitched. Thepanorama_filtering_metadata( ) according to an embodiment of the presentinvention may include information necessary for the filtering process.According to an embodiment of the present invention, when a panoramicimage is divided, encoded and then decoded, blocking artifacts arepresent at boundaries of images and thus filtering needs to be applied.

The panorama_filtering_metadata( ) according to an embodiment of thepresent invention may include a panorama_filtering_num field, apanorama_filtering_coordinate_x_div4 field, apanorama_filtering_coordinate_y_div4 field, apanorama_filtering_width_div4 field, a panorama_filtering_height_div4field and/or a smoothing_filter_coeff( ) field.

The panorama_filtering_num field may indicate whether filtering isapplied and/or the number of filtering processes.

The panorama_filtering_coordinate_x_div4 field and thepanorama_filtering_coordinate_y_div4 field may indicate the first pixelcoordinates of a part to which filtering is applied. Actual coordinatesmay be obtained by multiplying the values indicated by thepanorama_filtering_coordinate_x_div4 andpanorama_filtering_coordinate_y_div4 fields by 4. Here, the actualcoordinates may be based on the restored panoramic image.

The panorama_filtering_width_div4 field and thepanorama_filtering_height_div4 field may indicate the size (width andheight) of a region to which filtering needs to be applied. The actualsize may be obtained by multiplying the values of these fields by 4.

The smoothing_filter_coeff( ) field may indicate a most suitablesmoothing filter coefficient per content item.

FIG. 23 is a diagram illustrating a composition of theextraction_info_metadata( ) according to an embodiment of the presentinvention.

The extraction_info_metadata( ) according to an embodiment of thepresent invention may include a sub_video_width_div8 field, asub_video_height_div8 field, a sub_video_aspect_ratio field, asub_video_view_id field, a sub_video_priority field, asub_video_cropping_start_x_div8 field, a sub_video_cropping_start_y_div8field and/or a sub_video_afd_bar( ) field.

The sub_video_width_div8 field, the sub_video_height_div8 field and thesub_video_aspect_ratio field may indicate width, height and aspect ratioinformation corresponding to resolution information of a sub-video to beseparated or cropped.

The sub_video_view_id field may indicate an ID for identifying a croppedimage.

The sub_video_priority field may indicate priority of an image to becropped.

The sub_video_cropping_start_x_div8 field and thesub_video_cropping_start_y_div8 field may indicate the start point (x,y) of coordinate values for separating a sub-video from a panoramicimage. Actual coordinates may be obtained by multiplying the values ofeach field by 8. Here, the extraction_info_metadata( ) may include afield indicating the end point (x, y) of the coordinate values.

The sub_video_afd_bar( )field is identical to the sub_video_afd_bar()field included in the aforementioned panorama_composition_metadata( )which has been described above.

FIG. 24 is a diagram illustrating a composition of a video stream basedon scenario 2 according to an embodiment of the present invention.

While one stream is formed for a panoramic image, the image may bedivided by assigning a fixed ID to each region to be cropped accordingto an embodiment of the present invention. In this case, an embodimentof the present invention may divide and/or separate the panoramic imageusing sub_video_stream_id without information about coordinate valuesfor cropping. Accordingly, the number of bits may be reduced. Accordingto an embodiment of the present invention, the number of bits may bedecreased using the sub_video_stream_id, compared to a method ofdividing a panoramic image using coordinate values for cropping.

FIG. 25 is a diagram illustrating a composition of ROI_info_metadata ( )according to an embodiment of the present invention.

According to an embodiment of the present invention, additionalinformation about an ROI may be signaled through the ROI_info_metadata(). Since basic information about a panoramic image is provided bydefault, an embodiment of the present invention may additionally deliverthe additional information about the ROI in a decoded base layer stream.Here, the ROI may be referred to as a region of interest. The additionalinformation may be referred to as enhancement data and/or residual data.

The ROI_info_metadata( ) according to an embodiment of the presentinvention may include an ROI_video_profile field, an ROI_video_levelfield, an ROI_video_tier field, an ROI_video_priority field, anROI_video_dynamic_range field, an ROI_video_color_gamut field, anROI_video_width_div8 field, an ROI_video_height_div8 field, anROI_start_x_div8 field, an ROI_start_y_div8 field and/or anROI_filtering_info_descriptor( ).

The ROI_video_profile field, the ROI_video_level field and theROI_video_tier field may indicate profile, level and tier informationabout an ROI.

The ROI_video_priority field may indicate priority of regions ofinterest, which is indicated by the aforementioned ROI_num. According toan embodiment of the present invention, high-definition services may beprovided according to priority and the user may select a service.

The ROI_video_dynamic_range field and the ROI_video_color_gamut fieldmay indicate the dynamic range and color gamut of the ROI. According toan embodiment of the present invention, high-definition ROI services maybe provided through a higher frame rate, a high dynamic range, a widecolor gamut, a chroma subsampling (4:2:2 or 4:4:4), higher resolutionand the like. The high frame rate, chroma subsampling (4:2:2 or 4:4:4)and higher resolution may be identified by a level (higher frame rateand higher resolution) and a profile (chroma subsampling) and signaled.ROI_info_metadata( ) according to another embodiment of the presentinvention may include fields that signal a high frame rate, chromasubsampling (4:2:2 or 4:4:4) and/or higher resolution. The profileaccording to an embodiment of the present invention may be identifiedfor chroma subsampling as well as for bit depth.

The ROI_video_width_div8 field and the ROI_video_height_div8 fieldindicate the resolution of the ROI. Here, actual resolution maycorrespond to (ROI_video_width_div8 fieldvalue*8)*(ROI_video_height_div8 field value*8). The ROI_info_metadata( )according to an embodiment of the present invention may include a fieldindicating the aspect ratio of the ROI.

The ROI_start_x_div8 field and the ROI_start_y_div8 field may indicatethe start coordinate values (x,y) of the ROI. The coordinate values(x,y) are values with the whole panoramic image and actual coordinatevalues may be obtained by multiplying the value of each field by 8.Another embodiment of the present invention may signal the end point ofthe ROI instead of the start point thereof. An ROI service according toan embodiment of the present invention may be provided through theROI_start_x_div8, ROI_start_y_div8, ROI_video_width_div8 and/orROI_video_height_div8 fields.

The ROI_filtering_info_descriptor( ) may include information about afiltering process necessary when an enhancement layer signal of the ROIis merged with a base layer signal. According to an embodiment of thepresent invention, filtering may be added when the enhancement layersignal of the ROI is merged with the base layer signal. Here, theROI_filtering_info_descriptor( ) may include the fields included in theaforementioned panorama_filtering_metadata( ).

FIG. 26 is a diagram illustrating a composition of a service descriptiontable (SDT).

The SDT according to an embodiment of the present invention may includea table_id field, a section_syntax_indicator field, a section_lengthfield, a transport_stream_id field, a version_number field, acurrent_next_indicator field, a section_number field, alast_section_number field, an original_network_id field, a service_idfield, an EIT_schedule_flag field, an EIT_present_following_flag field,a running_status field, a free_CA_mode field, a descriptors_loop_lengthfield, a descriptor( ) and/or a CRC_32 field.

The table_id field identifies the type of the table. The table_id fieldmay indicate that a relevant table section constitutes the SDT.

The section_syntax_indicator field indicates the format of a tablesection following the field. When the field is 0, the table sectionindicates a short format. When the field is 1, the table sectionconforms to a general long format. (section_syntax_indicator: thesection_syntax_indicator is a 1-bit field which shall be set to “1”.)

The section_length field indicates the length of the relevant tablesection. The section_length field may indicate the length from the fieldto the end of the table section. (section_length: this is a 12-bitfield, the first two bits of which shall be “00”. It specifies thenumber of bytes of the section, starting immediately following thesection_length field and including the CRC. The section_length shall notexceed 1,021 so that the entire section has a maximum length of 1,024bytes.)

The transport_stream_id field identifies a transport stream (TS)described in the table. (transport_stream_id: this is a 16-bit fieldwhich serves as a label for identification of the TS, about which theSDT informs, from any other multiplex within the delivery system.)

The version_number field indicates the version number of a private tablesection. A receiver may detect a latest table section from among tablesections stored in a memory using the field and thecurrent_next_indicator field which will be described later.(version_number: this 5-bit field is the version number of thesub_table. The version_number shall be incremented by 1 when a change inthe information carried within the sub_table occurs. When it reachesvalue “31”, it wraps around to “0”. When the current_next_indicator isset to “1”, then the version_number shall be that of the currentlyapplicable sub_table. When the current_next_indicator is set to “0”,then the version_number shall be that of the next applicable sub_table.)

The current_next_indicator field indicates that the currently deliveredtable is valid when the value thereof is 1 and indicates that thecurrently delivered table is not currently valid but will be valid whenthe value thereof is 0. (current_next_indicator: this 1-bit indicator,when set to “1” indicates that the sub_table is the currently applicablesub_table. When the bit is set to “0”, it indicates that the sub_tablesent is not yet applicable and shall be the next sub_table to be valid.)

The section_number field indicates the number of the relevant section inthe table. (section_number: this 8-bit field gives the number of thesection. The section_number of the first section in the sub_table shallbe “0x00”. The section_number shall be incremented by 1 with eachadditional section with the same table_id, transport_stream_id, andoriginal_network_id.)

The last_section_number field indicates the number of the last sectionfrom among sections constituting the table. (last_section_number: this8-bit field specifies the number of the last section (that is, thesection with the highest section_number) of the sub_table of which thissection is part.)

The original_network_id field may identify an originating broadcaststation that transmits the service described in the table.(original_network_id: this 16-bit field gives the label identifying thenetwork_id of the originating delivery system.)

The service_id field identifies each service present within a transportstream. The service_id field may have the same function as theprogram_number field in a PMT. (service_id: this is a 16-bit field whichserves as a label to identify this service from any other service withinthe TS. The service_id is the same as the program_number in thecorresponding program_map_section.)

The EIT_schedule_flag field indicates that an EIT schedule flag ispresent in the current TS when having a value of 1 and indicates thatthe EIT schedule flag is not present when having a value of 0.(EIT_schedule_flag: this is a 1-bit field which when set to “1”indicates that EIT schedule information for the service is present inthe current TS, see TR 101 211 [i.2] for information on maximum timeinterval between occurrences of an EIT schedule sub_table. If the flagis set to 0 then the EIT schedule information for the service should notbe present in the TS.)

The EIT_present_following_flag field indicates thatEIT_present_following information for a service is present within thecurrent TS when having a value of 1 and indicates that theEIT_present_following information is not present when having a value of0. (EIT_present_following_flag: this is a lbit field which when set to“1” indicates that EIT_present_following information for the service ispresent in the current TS, see TR 101 211 [i.2] for information onmaximum time interval between occurrences of an EIT present/followingsub_table. If the flag is set to 0 then the EIT present/followinginformation for the service should not be present in the TS.)

The running_status field indicates a service status. For example, therunning_status field may indicate that a relevant service is “notrunning” when having a value of 1, indicate that the service “starts ina few seconds” when having a value of 2, indicate the service is“pausing” when having a value of 3, indicate that the service is“running” when having a value of 4 and indicate that “service offair”when having a value of 5. (running_status: this is a 3-bit fieldindicating the status of the service as defined in table 6. For an NVODreference service the value of the running_status shall be set to “0”.)

The free_CA_mode field indicates that component streams of a servicehave not been scrambled when having a value of 0 and indicates thataccess to one or more streams is controlled by a CA system when having avalue of 1. CA system is short for conditional access system and refersto a system that provides a broadcast content encoding function and afunction of allowing only subscribers to decode encoded broadcastcontent to view the broadcast content in order to limit broadcastcontent users to subscribers. (free_CA_mode: this 1-bit field, when setto “0” indicates that all the component streams of the service are notscrambled. When set to “1” it indicates that access to one or morestreams may be controlled by a CA system.)

The descriptors_loop_length field indicates the total length ofdescriptors following the field. (descriptors_loop_length: this 12-bitfield gives the total length in bytes of the following descriptors.)

The descriptor( ) refers to a descriptor describing each service.According to an embodiment of the present invention, the aforementionedpanorama_composition_info may be included in the descriptor( ) in orderto provide the panorama service and/or program guide information.

The CRC_32 field indicates a CRC value used to check whether dataincluded in the relevant table section has an error. (CRC_32: this is a32-bit field that contains the CRC value that gives a zero output of theregisters in the decoder.)

FIG. 27 is a diagram illustrating a composition of an event informationtable (EIT) according to an embodiment of the present invention.

The EIT according to an embodiment of the present invention includes atable_id field, a section_syntax_indicator field, a section_lengthfield, a service_id field, a version_number field, acurrent_next_indicator field, a section_number field, alast_section_number field, a transport_stream_id field, anoriginal_network_id field, a segment_last_section_number field, alast_table_id field, an event_id field, a start_time field, a durationfield, a running_status field, a free_CA_mode field, adescriptors_loop_length field, a descriptor( )f ield and/or a CRC_32field.

The table_id field identifies the type of the table. The table_id mayindicate that a relevant table section constitutes the EIT.

The section_syntax_indicator field indicates the format of the tablesection following the field. This field indicates that the table sectionis a short format when having a value of 0 and indicates that the tablesection conforms to the general long format when having a value of 1.

The section_length field indicates the length of the relevant tablesection. The section_length field may indicate the length from the fieldto the end of the table section.

The service_id field identifies each service present within a transportstream. The service_id field may have the same function as theprogram_number field in the PMT.

The version_number field indicates the version number of private tablesection. A receiver may detect a latest table section from among tablesections stored in a memory using the field and thecurrent_next_indicator field which will be described later.

The current_next_indicator field indicates that the currently deliveredtable is valid when the value thereof is 1 and indicates that thecurrently delivered table is not currently valid but will be valid whenthe value thereof is 0.

The section_number field indicates the number of the relevant section inthe table.

The last_section_number field indicates the number of the last sectionfrom among sections constituting the table.

The transport_stream_id field identifies a transport stream (TS)described in the table.

The original_network_id field may identify an originating broadcaststation that transmits the service or event described in the table.

The segment_last_section_number field indicates the last section numberof the relevant segment when a sub table is present. When the sub tableis not segmented, the value indicated by this field may be the same asthe value indicated by the last_section_number field.

The last_table_id field indicates the ID of a used last table.

The event_id field identifies each event and has a unique value withinone service.

The start_time field indicates the start time of the relevant event.

The duration field indicates the duration of the relevant event. Forexample, when the duration of a program is 1 hour 45 minutes 30 seconds,the duration field may indicate 0x014530.

The running_status field indicates the status of the relevant event.

The free_CA_mode field indicates that component streams of a servicehave not been scrambled when having a value of 0 and indicates thataccess to one or more streams is controlled by a CA system when having avalue of 1. CA system is short for conditional access system and refersto a system that provides a broadcast content encoding function and afunction of allowing only subscribers to decode encoded broadcastcontent to view the broadcast content in order to limit broadcastcontent users to subscribers.

The descriptors_loop_length field indicates the total length ofdescriptors following the field.

The descriptor( ) refers to a descriptor describing each service.According to an embodiment of the present invention, the aforementionedpanorama_composition_info may be included in the descriptor( ) in orderto provide the panorama service and/or program guide information.

The CRC_32 field indicates a CRC value used to check whether dataincluded in the relevant table section contains an error.

The EIT according to an embodiment of the present invention may bedelivered in the form of a table within a TS or delivered in the form ofxml through IP streaming.

FIG. 28 is a diagram illustrating a composition of linkage_descriptor( )included in the EIT according to an embodiment of the present invention.

According to an embodiment of the present invention, thelinkage_descriptor( ) may be included in an event level descriptor ofthe EIT.

The linkage_descriptor( ) according to an embodiment of the presentinvention may include a descriptor_length field, a transport_stream_idfield, an original_network_id field, a service_id field, a linkage_typefield and/or advanced_event_linkage_info( ).

The descriptor_tag field may indicate that the descriptor is alinkage_descriptor.

The descriptor_length field may indicate the length of the descriptor.

The transport_stream_id field may indicate the ID of a TS including aninformation service. (This is a 16-bit field which identifies the TScontaining the information service indicated.)

The original_network_id field may indicate the network id of anoriginating delivery system of the information service. (This 16-bitfield gives the label identifying the network_id of the originatingdelivery system of the information service indicated.)

The service_id field may identify information service within a TS. (Thisis a 16-bit field which uniquely identifies an information servicewithin a TS. The service_id is the same as the program_number in thecorresponding program_map_section. If the linkage_type field has thevalue 0x04, then the service_id field is not relevant, and shall be setto 0x0000.)

The linkage_type field may indicate the type of linkage for theinformation service. (This is an 8-bit field specifying the type oflinkage.)

The advanced_event_linkage_info( ) will be described in detail later.

According to an embodiment of the present invention, when a panoramaevent and/or service corresponding to a broadcast service currentlyviewed by the user are indicated, 0x0F may be used as the linkage_typetype. When an HD and/or 3D service corresponding to a panorama eventand/or service currently viewed by the user are indicated, 0x0E may beused as the linkage_type type. In addition, when a UHD servicecorresponding to a panorama event and/or service currently viewed by theuser is indicated, 0x0E may be used as the linkage_type type.

FIG. 29 is a diagram illustrating the type of a target service accordingto link_type when linkage_type is 0x0E according to an embodiment of thepresent invention.

According to an embodiment of the present invention, a link_type valueof 0 may indicate that the target service is an SD service and alink_type value of 1 may indicate that the target service is an HDservice. A link_type value of 2 may indicate that the target service isa frame compatible plano-stereoscopic service and a link_type value of 3may indicate that the target service is a service compatibleplano-stereoscopic service.

Referring to the figure, when the linkage_type is 0x0E, there is noremaining bit in the link_type assigned two bits, and thus an embodimentof the present invention may assign a new linkage_type value of 0x0F andsignal that a target event and/or service are panorama event and/orservice using a combination of a link_type value and a linkage_typevalue. Here, when the target service is an SD or HD service,extended_event_linkage_info( ) may be used without being modified.

According to an embodiment of the present invention, when thelinkage_type is 0x0F, advanced_event_linkage_info( ) may include alink_type field indicating that a target event and/or service are apanorama event and/or service, which will be described in detail later.

FIG. 30 is a diagram illustrating a composition ofadvanced_event_linkage_info( ) according to an embodiment of the presentinvention.

According to an embodiment of the present invention, when thelinkage_type field is 0x0F, the advanced_event_linkage_info( ) thatsignals a panorama event and/or service may be included in thelinkage_descriptor.

The advanced_event_linkage_info( ) according to an embodiment of thepresent invention may include num_link_event, link_simulcast,link_delivery_type, detail_info_flag, link_type, link_event_id,link_original_network_id, link_transport_stream_id, link_service_id,delivery_detail_info( ) and/or time_shift_detail_info( ) fields.

The num_link_event may indicate the number of links.

The link_simulcast field may indicate whether a relevant event and/orservice are broadcast simultaneously with the current event and/orservice. For example, when the value of the link_simulcast field is 1,the link_simulcast field may indicate that the relevant event and/orservice and the current event and/or service are simultaneouslybroadcast without a time difference therebetween.

The link_delivery_type field may indicate the type of a path(terrestrial, satellite, cable, IP and the like) through which therelevant event and/or service are broadcast. When the relevant eventand/or service are broadcast through the same path or the same scheme,“‘001” may be designated as the link_delivery_type field. If a differenttransport parameter (e.g., a modulation scheme related parameter) isused for the same path, information corresponding to the path may bedesignated (e.g., a value between “010” and “100”), and detailedparameter information may be signaled through delivery_detail_info( )which will be described later. Here, the link_delivery_type field maysignal the same delivery path of the same event, such as cable, IP orterrestrial.

The detail_info_flag field may indicate whether information about aphysical delivery parameter regarding a linked event and/or service isincluded.

The link_type field indicates the service type of the relevant event orservice. For example, values of the detail_info_flag field may indicatethe following UHD video information and/or panorama service information.“001” indicates 4K UHD, 8 bits and 4:2:0, “010” indicates 4K UHD, 10bits and 4:2:0, “011” indicates 4K UHD, 10 bits and 4:2:2, “0x10”indicates panorama, “0x11” indicates panorama, HDR provision, WCGprovision.

The link_event_id, link_original_network_id, link_transport_stream_idand link_service_id fields may respectively indicate event_id,original_network_id, transport_stream_id and service_id of the relevantevent and/or service.

The delivery_detail_info( ) indicates a physical delivery parameterabout a linked event and/or service. For example, information such as amodulation scheme, frequency information and an FEC scheme of deliveredevent data may be signaled using the delivery_detail_info( ).

The time_shift_detail_info( ) may signal information about a timedifference between a linked event and/or service and the current eventand/or service when the time difference is present. A field indicating atime shift for broadcasting in minutes may be included in thetime_shift_detail_info( ) according to an embodiment. As another exampleof signaling the time difference, the event_id and time informationabout the event identified with the event_id may be referred to in arelated EIT.

FIG. 31 is a diagram illustrating a composition of a program map table(PMT) and the position of panorama_composition_info( ) included in thePMT.

According to an embodiment of the present invention, thepanorama_composition_info( ) may be divided into a program level and avideo (stream) level in the PMT and signaled at respective levels.

The PMT according to an embodiment of the present invention includestable_id, section_syntax_indicator, section_length, program_number,version_number, current_next_indicator, section_number,last_section_number, PCR_PID, program_info_length, descriptor( ),stream_type, elementary_PID, ES_info_length, descriptor( )and/or CRC_32fields.

The table_id field identifies the type of the table. The table_id fieldmay indicate whether a relevant table section constitutes the PMT.

The section_syntax_indicator field indicates the format of the tablesection following the field. When the section_syntax_indicator field is0, the relevant table section is in a short format. When thesection_syntax_indicator field is 1, the relevant table section is inthe general long format.

The section_length field indicates the length of the relevant tablesection. Since the section_length field indicates the length from thefield to the end of the table section, the actual length of the tablesection may be obtained by adding 3 bytes to the value indicated by thesection_length field.

The program_number field identifies each program service or virtualchannel present in a transport stream.

The version_number field indicates the version number of a private tablesection. A receiver may detect a latest section from among tablesections stored in a memory using this field and thecurrent_next_indicator field which will be described later.

A current_next_indicator field value of 1 indicates that the currentlydelivered table is valid and a current_next_indicator field value of 0indicates that the currently delivered table is not currently valid butwill be valid.

The section_number field indicates the number of a relevant section inthe table.

The last_section_number field indicates the number of the last sectionfrom among sections constituting the table.

The PCR_PID field indicates a packet ID corresponding to a program clockreference (PCR) for a program service.

The program_info_length field indicates the length of a descriptordescribing the following program information.

The descriptor( ) refers to a descriptor that describes a programcorresponding to the relevant table section. According to an embodimentof the present invention, the panorama_service_type,panorama_composition_info_ver, panorama_width_div32,panorama_height_div32, panorama_profile, panorama_level and/orpanorama_tier fields, from among the fields included in thepanorama_composition_info, may be included in the descriptor signaled atthe program level of the PMT.

The stream_type field indicates the type of each unit stream thatconstitutes the program described by the table.

The elementary_PID field indicates the packet ID of each unit streamthat constitutes the program described by the table. According to anembodiment of the present invention, when a panoramic image is dividedinto a plurality of images and a plurality of streams including thedivided images is present, this field may allocate differentelementary_PID values to the respective streams.

The ES_info_length field indicates the length of a descriptor describinginformation ES_info about following unit streams.

The descriptor( ) refers to a descriptor that indicates informationabout one of unit streams constituting the program described by thetable. According to an embodiment of the present invention, thepanorama_stream_num, panorama_view_num, panorama_view_priority,included_stream_id, panorama_composition_metadata( ),panorama_filtering_metadata( ), cropping_region_num,extraction_info_metadata( ), ROLnum, ROI_codec_type and/orROI_info_metadata( ) fields, from among the fields included in thepanorama_composition_info, may be included in the descriptor signaled atthe video (stream) level of the PMT.

The CRC_32 field indicates a CRC value used to check whether dataincluded in the relevant table section contains an error.

The PMT according to an embodiment of the present invention may bedelivered in band through MPEGTS or PSI including the PMT may bedelivered in the form of xml through IP.

FIG. 32 is a diagram illustrating a composition of a terrestrial virtualchannel table (TVCT) according to an embodiment of the presentinvention.

The panorama_composition_info according to an embodiment of the presentinvention may be included in a channel level descriptor of the TVCT.

The TVCT according to an embodiment of the present invention may includetable_id, section_syntax_indicator, private_indicator, section_length,transport_stream_id, version_number, current_next_indicator,section_number, last_section_number, protocol_version,num_channels_in_section, short_name, maj or_channel_number,minor_channel_number, modulation mode, carrier_frequency, channel_TSID,program_number, ETM_location, access_controlled, hidden, hide_guide,service_type, source_id, descriptors_length and/or descriptor( ) fields.

The table_id field identifies the table.

The section_syntax_indicator field is a 1-bit field set to 1 to indicatethe long form of the MPEG2 private_section table. (This 1-bit fieldshall be set to “1” to always indicate the “long” form of the MPEG2private_section table.)

The private_indicator field is a 1-bit field set to 1. (This 1 bit fieldshall be set to ‘1’.)

The section_length field indicates the length of the table sectionfollowing this field in bytes. (This is a 12-bit field, the first twobits of which shall be “00”. It specifies the number of bytes of thesection, starting immediately following the section_length field andincluding the CRC. The section_length shall not exceed 1021 so that theentire section has a maximum length of 1024 bytes.)

The transport_stream_id field indicates the id of an MPEG2 transportstream (TS) within the table. (To distinguish each transport streamwithin a single network (terrestrial, cable or satellite) from another,MPEG2 established the use of a 16 bit (ranging from 0 to 65535)transport_stream_identifier, which is also called a TSID.)

The version_number field is a 5-bit field indicating the version numberof the table. (This 5-bit field is the version number of thePSIP_section. The version_number shall be incremented by 1 modulo 32when a change in the information carried within the PSIP_section occurs.When the current_next_indicator is set to ‘0’, then the version_numbershall be that of the next applicable PSIP_section with the sametable_id, table_id_extension, and section_number.)

The current_next_indicator field is a 1-bit field and indicates whetherthe table is currently applicable or applicable next time. (A 1-bitfield, which when set to ‘1’ indicates that the PSIP_section sent iscurrently applicable. When the current_next_indicator is set to ‘1’,then the version_number shall be that of the currently applicablePSIP_section. When the bit is set to ‘0’, it indicates that thePSIP_section sent is not yet applicable and shall be the nextPSIP_section with the same section_number, table_id_extension, andtable_id to become valid.)

The section_number field indicates a section number. (This 8-bit fieldgives the number of the PSIP_section. The section_number of the firstsection in a PSIP table shall be 0x00. The section_number shall beincremented by 1 with each additional section in PSIP table. The scopeof the section_number shall be defined by the table_id andtable_id_extension. That is, for each PSIP table and value of thetable_id_extension field, there is the potential for the full range ofsection_number values.)

The last_section_number field identifies the number of the last section.(This 8-bit field specifies the number of the last section (that is, thesection with the highest section_number) of the PSIP table of which thissection is a part. Its scope is the same as for the section_numberfield.)

The protocol_version field has a function to allow the current tabletype to carry parameters different from parameters defined in thecurrent protocol in the future. (An 8-bit unsigned integer field whosefunction is to allow, in the future, this table type to carry parametersthat may be structured differently than those defined in the currentprotocol. At present, the only valid value for protocol_version is zero.Non-zero values of protocol_version may be used by a future version ofthis standard to indicate structurally different tables.)

The num_channels_in_section field indicates the number of virtualchannel definitions. (The num_channels_in_section field in ATSC CableVirtual Channel table CVCT table sections is an 8-bit field thatindicates the number of virtual channel definitions to follow in thetable section.)

The short_name field is a 112-bit field indicating a short name for avirtual channel (The short_name field is a 112-bit field in ATSC CVCTtable sections that gives the short_name for the virtual channel Eachletter of the short_name is formatted as a 16-bit Unicode character,with the high order byte transmitted first. So, short_name for TVCT andCVCT entries is seven Unicode characters, which short_name for SVCTentries is eight Unicode characters. If the display name is less thanthe number of permitted characters, 0/0x00 is appended to the end untilthe allotted number of bits has been reached.)

The major_channel_number field indicates the number of major channelsassociated with a virtual channel. (A 10-bit number that represents the“major” channel number associated with the virtual channel being definedin this iteration of the “for” loop. Each virtual channel shall beassociated with a major and a minor channel number. The major channelnumber, along with the minor channel number, act as the user's referencenumber for the virtual channel. The major_channel_number shall bebetween 1 and 99. The value of major_channel_number shall be set suchthat in no case is a major_channel_number/minor_channel_number pairduplicated within the TVCT.)

The minor_channel_number field indicates the number of minor channelsassociated with a virtual channel. (A 10-bit number in the range 0 to999 that represents the “minor” or “sub” channel number. This field,together with major_channel_number, performs as a two-part channelnumber, where minor_channel_number represents the second or right-handpart of the number. When the service_type is analog television,minor_channel_number shall be set to 0.)

The modulation mode field indicates a modulation scheme for a transportcarrier of a virtual channel (The modulation_mode is an 8-bit field in avirtual channel entry tells receivers the modulation used to transmitindividual channels.)

The carrier_frequency field transmits carrier frequency information usedfor virtual channel transport. (The carrier frequency is a 32-bit fieldthat transmits the carrier frequency used by the transport carrying thevirtual channel.)

The channel_TSID field indicates the MPEG2 transport stream ID of a TScarrying an MPEG2 program associated with a virtual channel. (Thechannel_TSID is a 16-bit unsigned integer field that gives thetransport_stream_id of the channel that carries (or for inactivechannels, will carry) the virtual channel.)

The program_number field identifies each program service or virtualchannel within a TS. (The program_number is a 16-bit unsigned integerthat uniquely identifies each program service (or virtual channel)present in a transport stream.)

The ETM_location field indicates presence or absence of an extended textmessage for a channel, event or data event. (The ETM_location fielddenotes whether there is an extended text message for the channel(Channel Extended Text table or CETT), event (Event Extended Text table)or data event (Data Extended Text table).)

The access_controlled field indicates whether an event associated with arelevant virtual channel is controllable. (When access_controlled is setto ‘1’, means that events associated with this virtual channel may beaccess controlled. When set to ‘0’, access to event is not controlled.)

The hidden field indicates whether a relevant channel is accessible by adirect entry (or field, attribute or entity) of a virtual channelnumber. (When hidden is set to ‘1’, means the channel cannot be accessedby direct entry of the virtual channel number. When set to ‘0’, virtualcan be accessed by direct entry.)

The hide_guide field indicates whether a relevant channel is accessibleby the direct entry (or field, attribute or entity) of the virtualchannel number. (When hide_guide is set to ‘1’, means the channel cannotbe accessed by direct entry of the virtual channel number. When set to‘0’, virtual can be accessed by direct entry.)

The service_type field identifies the type of a service set in a virtualchannel (The service_type is a 6bit enumerated field that identifies thetype of service set in the virtual channel) Service_type of the panoramaservice according to an embodiment of the present invention may bedesignated as a parameterized service (0x07), an extended parameterizedservice (0x09) and/or a new DTV service panorama service (0x10). Theaforementioned service names and values are exemplary and may be set toother names or values.

The source_id field is a 16-bit unsigned integer and indicates aprogramming source associated with a virtual channel. (A 16-bit unsignedinteger number that identifies the programming source associated withthe virtual channel In this context, a source is one specific source ofvideo, text, data, or audio programming Source ID value zero isreserved. Source ID values in the range 0x0001 to 0x0FFF shall be uniquewithin the Transport Stream that carries the VCT, while values 0x1000 to0xFFFF shall be unique at the regional level. Values for source_Ids0x1000 and above shall be issued and administered by a RegistrationAuthority designated by the ATSC.)

The descriptors_length field signals the length in bytes of thefollowing descriptor field. (The descriptors_length is a 10bit unsignedinteger field that signals the length in bytes of the descriptor fieldto follow. If there are no descriptors present, zero would beappropriate.)

The descriptor( ) field is a descriptor loop located within the table.The descriptor loop may include an additional descriptor. Thepanorama_composition_info according to an embodiment of the presentinvention may be included in the descriptor( ).

FIG. 33 is a diagram illustrating a composition of a cable virtualchannel table (CVCT) according to an embodiment of the presentinvention.

The panorama_composition_info according to an embodiment of the presentinvention may be included in a channel level descriptor of the CVCT.

The CVCT may include table_id, section_syntax_indicator,private_indicator, section_length, transport_stream_id, version_number,current_next_indicator, section_number, last_section_number,protocol_version, num_channels_in_section, short_name,major_channel_number, minor_channel_number, modulation mode,carrier_frequency, channel_TSID, program_number, ETM_location,access_controlled, hidden, path_select, out_of_band, hide_guide,service_type, source_d, descriptors_length and/or descriptor( ) fields.

The table_id field identifies the table.

The section_syntax_indicator is a 1-bit field set to 1 to indicate along form of an MPEG2 private_section table. (This 1-bit field shall beset to “1” to always indicate the “long” form of the MPEG2private_section table.)

The private_indicator field is a 1-bit field set to 1. (This 1bit fieldshall be set to “1”.)

The section_length field indicates the length in bytes of the followingtable section. (This is a 12-bit field, the first two bits of whichshall be “00”. It specifies the number of bytes of the section, startingimmediately following the section_length field and including the CRC.The section_length shall not exceed 1021 so that the entire section hasa maximum length of 1024 bytes.)

The transport_stream_id field indicates the id of an MPEG2 TS within thetable. (To distinguish each transport stream within a single network(terrestrial, cable or satellite) from another, MPEG2 established theuse of a 16bit (ranging from 0 to 65535) transport_stream_identifier,which is also called a TSID.)

The version_number field is a 5-bit field indicating the version numberof the table. (This 5-bit field is the version number of thePSIP_section. The version_number shall be incremented by 1 modulo 32when a change in the information carried within the PSIP_section occurs.When the current_next_indicator is set to “0”, then the version_numbershall be that of the next applicable PSIP_section with the sametable_id, table_id_extension, and section_number.)

The current_next_indicator field is a 1-bit field and indicates whetherthe table is currently applicable or applicable next time. (A 1bitfield, which when set to “1” indicates that the PSIP_section sent iscurrently applicable. When the current_next_indicator is set to “1”,then the version_number shall be that of the currently applicablePSIP_section. When the bit is set to “0”, it indicates that thePSIP_section sent is not yet applicable and shall be the nextPSIP_section with the same section_number, table_id_extension, andtable_id to become valid.)

The section_number field indicates the number of a section. (This 8-bitfield gives the number of the PSIP_section. The section_number of thefirst section in a PSIP table shall be 0x00. The section_number shall beincremented by 1 with each additional section in PSIP table. The scopeof the section_number shall be defined by the table_id andtable_id_extension. That is, for each PSIP table and value of thetable_id_extension field, there is the potential for the full range ofsection_number values.)

The last_section_number field identifies the number of the last section.(This 8-bit field specifies the number of the last section (that is, thesection with the highest section_number) of the PSIP table of which thissection is a part. Its scope is the same as for the section_numberfield.)

The protocol_version field has a function to allow the current tabletype to carry parameters different from parameters defined in thecurrent protocol in the future. (An 8-bit unsigned integer field whosefunction is to allow, in the future, this table type to carry parametersthat may be structured differently than those defined in the currentprotocol. At present, the only valid value for protocol_version is zero.Non-zero values of protocol_version may be used by a future version ofthis standard to indicate structurally different tables.)

The num_channels_in_section field indicates the number of virtualchannel definitions. (The num_channels_in_section field in ATSC CableVirtual Channel table CVCT table sections is an 8-bit field thatindicates the number of virtual channel definitions to follow in thetable section.)

The short_name field is a 112-bit field indicating a short name for avirtual channel (The short_name field is a 112-bit field in ATSC CVCTtable sections that gives the short_name for the virtual channel Eachletter of the short_name is formatted as a 16-bit Unicode character,with the high order byte transmitted first. So, short_name for TVCT andCVCT entries is seven Unicode characters, which short_name for SVCTentries is eight Unicode characters. If the display name is less thanthe number of permitted characters, 0/0x00 is appended to the end untilthe allotted number of bits has been reached.)

The major_channel_number field indicates the number of major channelsassociated with a virtual channel (A 10-bit number that represents the“major” channel number associated with the virtual channel being definedin this iteration of the “for” loop. Each virtual channel shall beassociated with a major and a minor channel number. The major channelnumber, along with the minor channel number, act as the user's referencenumber for the virtual channel. The major_channel_number shall bebetween 1 and 99. The value of major_channel_number shall be set suchthat in no case is a major_channel_number/minor_channel_number pairduplicated within the TVCT.)

The minor_channel_number field indicates the number of major channelsassociated with a virtual channel. (A 10-bit number in the range 0 to999 that represents the “minor” or “sub” channel number. This field,together with major_channel_number, performs as a two-part channelnumber, where minor_channel_number represents the second or right-handpart of the number. When the service_type is analog television,minor_channel_number shall be set to 0.)

The modulation mode field indicates a modulation scheme for a transportcarrier of a virtual channel (The modulation_mode is an 8-bit field in avirtual channel entry tells receivers the modulation used to transmitindividual channels.)

The carrier_frequency field transmits carrier frequency information usedby transport carrying a virtual channel. (The carrier frequency is a32bit field that transmits the carrier frequency used by the transportcarrying the virtual channel)

The channel_TSID field indicates the MPEG2 transport stream ID of a TScarrying an MPEG2 program associated with a virtual channel (Thechannel_TSID is a 16bit unsigned integer field that gives thetransport_stream_id of the channel that carries (or for inactivechannels, will carry) the virtual channel)

The program_number field identifies each program service or virtualchannel within a TS. (The program_number is a 16bit unsigned integerthat uniquely identifies each program service (or virtual channel)present in a transport stream.)

The ETM_location field indicates presence or absence of an extended textmessage for a channel, event or data event. (The ETM_location fielddenotes whether there is an extended text message for the channel(Channel Extended Text table or CETT), event (Event Extended Text table)or data event (Data Extended Text table).)

The access_controlled field indicates whether an event associated with arelevant virtual channel is controllable. (When access_controlled is setto “1”, means that events associated with this virtual channel may beaccess controlled. When set to “0”, access to event is not controlled.)

The hidden field indicates whether a relevant channel is accessible by adirect entry (or field, attribute or entity) of a virtual channelnumber. (When hidden is set to “1”, means the channel cannot be accessedby direct entry of the virtual channel number. When set to “0”, virtualcan be accessed by direct entry.)

The path_select field is a field within the CVCT, which associates avirtual channel with a transmission path of an active channel (Thepath_select is a 1-bit field in a Cable Virtual Channel table (CVCT)entry that associates a virtual channel with a transmission path of anactive channel or when the channel will be active.)

The out_of_band field indicates whether a virtual channel is carried onan out-of-band (OOB) physical transmission channel (The out_of_band is a1-bit Boolean field in a Cable Virtual Channel table entry that when setto “1” is carried on the out-of-band physical transmission channel Whenclear or ‘0’, the virtual channel is carried within a tuned multiplex.When the channel is inactive, out_of_band reflects the channel that willbe valid when the channel is again active.)

The hide_guide field indicates whether a relevant channel is accessibleby the direct entry (or field, attribute or entity) of the virtualchannel number. (When hide_guide is set to “1”, means the channel cannotbe accessed by direct entry of the virtual channel number. When set to“0”, virtual can be accessed by direct entry.)

The service_type field identifies the type of a service set in a virtualchannel (The service_type is a 6-bit enumerated field that identifiesthe type of service set in the virtual channel) Service_type of thepanorama service according to an embodiment of the present invention maybe designated as a parameterized service (0x07), an extendedparameterized service (0x09) and/or a new DTV service panorama service(0x10). The aforementioned service names and values are exemplary andmay be set to other names or values.

The source_id field is a 16-bit unsigned integer and indicates aprogramming source associated with a virtual channel. (A 16-bit unsignedinteger number that identifies the programming source associated withthe virtual channel In this context, a source is one specific source ofvideo, text, data, or audio programming Source ID value zero isreserved. Source ID values in the range 0x0001 to 0x0FFF shall be uniquewithin the Transport Stream that carries the VCT, while values 0x1000 to0xFFFF shall be unique at the regional level. Values for source_Ids0x1000 and above shall be issued and administered by a RegistrationAuthority designated by the ATSC.)

The descriptors_length field signals the length in bytes of thefollowing descriptor field. (The descriptors_length is a 10-bit unsignedinteger field that signals the length in bytes of the descriptor fieldto follow. If there are no descriptors present, zero would beappropriate.)

The descriptor( ) field is a descriptor loop located within the table.The descriptor loop may include an additional descriptor. Thepanorama_composition_info according to an embodiment of the presentinvention may be included in the descriptor( )

FIG. 34 is a diagram illustrating a composition of service_type for thepanorama service according to an embodiment of the present invention.

The service_type of the panorama service according to an embodiment ofthe present invention may be designated as a parameterized service(0x07), an extended parameterized service (0x09) and/or a new DTVservice panorama service (0x10). The aforementioned service names andvalues are exemplary and may be set to other names and values.

When the panorama service according to an embodiment of the presentinvention is signaled through the parameterized service (0x07),information about the panorama service may be described through acomponent list descriptor and/or the panorama_composition_info( ).

When the panorama service according to an embodiment of the presentinvention is signaled through the extended parameterized service (0x09),the information about the panorama service may be described through thecomponent list descriptor, a parameterized service descriptor and/or thepanorama_composition_info( ).

When the panorama service according to an embodiment of the presentinvention is signaled through the new DTV service panorama service(0x10), the information about the panorama service may be describedthrough the panorama_composition_info( ).

FIG. 35 is a diagram illustrating a composition of acomponent_list_descriptor( ) according to an embodiment of the presentinvention.

According to an embodiment of the present invention, streams withrespect to a panoramic image may be signaled using thecomponent_list_descriptor( ) and the component_list_descriptor( )according to an embodiment of the present invention may be located atthe channel level of a VCT (including the TVCT and CVCT). According toan embodiment of the present invention, each elementary stream withrespect to each image included in the service may includestream_info_details( ) and the stream_info_details( ) may signalinformation about the streams with respect to the panoramic image. Inthe panorama service according to an embodiment of the presentinvention, information about each image may be signaled using thestream_info_details( ) according to an embodiment of the presentinvention even when the stream_type is MPEG2, AVC, HEVC or the like.

The component_list_descriptor( ) according to an embodiment of thepresent invention may include descriptor_tag, descriptor_length,alternate, component_count, stream_type, format_identifier,length_of_details and/or stream_info_details( ) fields.

The descriptor_tag field may indicate an id for identifying thecomponent_list_descriptor( ).

The descriptor_length field may indicate the length of this descriptor.

The alternate field may indicate whether a relevant instance of thecomponent_list_descriptor is primary information. (A flag thatindicates, when set to “1”, that this instance of thecomponent_list_descriptor( ) is a second, “alternate” description ofstreams associated with the virtual channel When the flag is set to “0’”the set of stream types in the instance of the descriptor is the“primary” or “preferred” set. If only one component_list_descriptor( )appears in the descriptor loop, the value of the alternate flag shall beset to “0”.)

The component_count field may indicate the number of components(streams) included in a relevant channel (service). (This 7-bit unsignedinteger shall specify the number of components specified in the “for”loop to follow. The value shall be in the range of 1 to 36.)

The stream_type field may indicate the stream type of a relevantcomponent. (This 8-bit unsigned integer field shall indicate thestream_type associated with the component described in this iteration ofthe “for” loop. Stream types in the range 0xC4 to 0xFF identify streamtypes defined privately (not described by ATSC Standards).)

The format_identifier field may identify an entity that provides thestream_type value. (This 32-bit unsigned integer shall correspond to theformat_identifier in the MPEG2 Registration Descriptor defined inISO/IEC 138181 [7] Section 2.6.9 and shall identify the entity providingthe stream_type value. The value of format_identifier shall be 0x47413934 (“GA94” in ASCII) unless the applicable ATSC standard specifies adifferent value, in which case that value shall be used. The stream_typevalues defined in ISO/IEC 138181 [7] and whose use is not standardizedby ATSC Standards shall use value 0x00000000 for format_identifier.)

The length_of_details field may indicate the length of the followingfield “stream_info_details( )”. (This 8-bit unsigned integer shallspecify the length, in bytes, of the defined length of thestream_info_details( )field to follow. The value of length_of_detailsshall be set to the length of the stream_info_details( )field that hasbeen defined for the associated stream_type value. The value shall be inthe range of 0 to 246 inclusive.)

The stream_info_details( ) field may indicate detailed information abouta relevant component. (This field shall provide further informationpertaining to the component identified by the value in the precedingstream_type field. The meaning and structure of the bits contained instream_info_details( ) shall be as specified in the standard definingthe meaning of the value in the stream_type field when used in an ATSCtransport stream. If ATSC standards define a stream_info_details( )structure for a given value of stream_type, the ATSC definition shalltake precedence over any definition originating from any other standardsdeveloping organization). The stream_info_details( ) field will bedescribed in detail below.

FIG. 36 is a diagram illustrating a composition of thestream_info_details( ) when the stream_type according to an embodimentof the present invention indicates a base stream.

According to an embodiment of the present invention, a panoramic imagemay be divided into a plurality of elementary streams (ESs) andtransmitted. The figure illustrates a composition ofstream_info_details( ) for the base stream from among the ESs.

The stream_info_details( ) according to an embodiment of the presentinvention may include panorama_base_view_profile,panorama_base_view_tier and/or panorama_base_view_level fields.

The panorama_base_view_profile, panorama_base_view_tier andpanorama_base_view_level fields may respectively indicate the profile,tier and level information of an image corresponding to the base stream.

FIG. 37 is a diagram illustrating a composition of thestream_info_details( ) when the stream_type according to an embodimentof the present invention indicates a stream other than the base stream.

According to an embodiment of the present invention, a panoramic imagemay be divided into a plurality of ESs and transmitted. The figureillustrates a composition of stream_info_details( ) for a stream otherthan the base stream from among the ESs.

The stream_info_details( ) according to an embodiment of the presentinvention may include panorama_view_profile, panorama_view_tier and/orpanorama_view_level fields.

The panorama_view_profile, panorama_view_tier and panorama_view_levelfields may respectively indicate the profile, tier and level informationof an image corresponding to the stream other than the base stream.

According to another embodiment of the present invention, a panoramicimage may be transmitted as one ES. In this case, the component_countfield of the aforementioned component_list_descriptor( ) may indicate 1,and thus only one stream_info_details( ) may be used. In this case, theES with respect to the panoramic image may be signaled through thestream_info_details( ) illustrated in the figure. Here, informationindicated by the panorama_view_profile, panorama_view_tier and/orpanorama_view_level fields may be the same as the profile, tier and/orlevel information of the panoramic image.

FIG. 38 is a diagram illustrating receiver operation when a mainreceiver decodes all streams and delivers the decoded streams to asub-receiver in scenario 1 according to an embodiment of the presentinvention.

Scenario 1 according to an embodiment of the present invention maytransmit a plurality of streams that constitutes a panoramic image to areceiving end.

The receiver according to an embodiment of the present invention mayinclude a demultiplexer 38010, a first decoder 38020, a second decoder38030, a signaling information processor (section data processor) 38040,a boundary filtering unit 38050 and/or a cropping unit 38060.

The demultiplexer may receive the streams constituting the panoramicimage and/or signaling information, extract the streams and/or signalinginformation and send the extracted streams and/or signaling informationto the decoders and/or the signaling information processor 38040.

The decoders (first decoder and/or second decoder) may decode thestreams delivered from the demultiplexer to generate divided images(video 1 and/or video 2). Here, the decoders may decode the streamsusing panorama_composition_information and/or the signaling informationprocessed by the signaling information processor.

The signaling information processor may process the signalinginformation extracted by the demultiplexer and deliver the processedsignaling information to the decoders. Here, the signaling informationmay include the aforementioned PMT, VCT, EIT and/or SDT.

The boundary filtering unit may restore the panoramic image from thedivided images using panorama_filtering_metadata.

The cropping unit may crop the panoramic image, restored by the boundaryfiltering unit, using extraction_info_metadata and deliver the croppedimages to another receiver through UPnP, HDMI and/or IP.

According to an embodiment of the present invention, a receiver thatreceives and decodes streams constituting a panoramic image maycorrespond to a main receiver and a receiver that receives a croppedimage from the main receiver may correspond to a sub-receiver.

A description will be given of detailed operation of a receiveraccording to an embodiment of the present invention.

The panorama_composition_info( ) according to an embodiment of thepresent invention may be received through SEI RBSP (raw byte sequencepayload) included in a video element stream. Here, the aforementionedinformation may be provided through the EIT, SDT or PMT.

The receiver according to an embodiment of the present invention mayread a panorama_composition_info SEI message having a nal_unit_typevalue corresponding to SEI data and a payloadType value of 52 by parsingan HEVC NAL unit. In addition, the receiver may parsepanorama_service_type and information about a panoramic image, that is,panorama_resolution, panorama_profile, panorama_level and panorama_tierinformation, and parse additional information with respect to a scenarioaccording to panorama_service_type.

In scenario 1 according to an embodiment of the present invention, atransmitter may divide the panoramic image into the number of streamsindicated by panorama_stream_num such that the streams include imagescompatible with existing receivers and encode the streams. The receiveraccording to an embodiment of the present invention may parsepanorama_composition_metadata( ) for each elementary stream. Anembodiment of the present invention may allow 16:9 DTV receivers todecode and output an image signaled as a base view insub_video_base_view. When the panoramic image is divided and outputusing a plurality of DTV receivers, an embodiment of the presentinvention may allow each DTV receiver to select, decode and output animage based on sub_video_stream_id. According to an embodiment of thepresent invention, images may be output using priority indicated by thesub_video_priority field.

In scenario 2 according to an embodiment of the present invention, areceiver may decode a panoramic image and separate an image usingcoordinate values (sub_video_cropping_start_x,sub_video_cropping_start_y) for cropping, included inextraction=mfo_metadata( ). If a 16:9 DTV receiver crops a part of thepanoramic image and outputs the cropped part without resizing thepanoramic image, an embodiment of the present invention may separate abase view image through the sub_video_base_view field. If the panoramicimage is output using multiple DTV receivers, receivers according to anembodiment of the present invention may decode the image, crop theimages according to sub_video_stream_id and output the cropped image.

In scenario 4 according to an embodiment of the present invention, atransmitter may transmit an additional stream with respect to an ROI asan enhancement layer signal. A receiver may acquire width/heightinformation corresponding to resolution of the ROI and/or coordinateinformation by parsing ROLinfo_metadata( ). The receiver may combine theenhancement layer signal with a base layer signal of the panoramic imageand/or part of the panoramic image using the acquired information todecode the image. According to an embodiment of the present invention, ahigh-definition ROI may be delivered to a second device or displayed onthe screen of a DTV receiver or part thereof.

In scenario 5 according to an embodiment of the present invention, whena 16:9 event separated from a panoramic image is viewed, a receiveraccording to an embodiment of the present invention may parse a linkagedescriptor with respect to the event when the linkage descriptor ispresent. The receiver may read advanced_event_linkage_info( ) when thelinkage_type field in the linkage descriptor is 0x0F. The receiveraccording to an embodiment of the present invention may acquire detailedinformation about the linked panorama broadcast event using theadvanced_event_linkage_info( ). The receiver may notify the user thatthe panorama broadcast service corresponding to the 16:9 event beingviewed may be provided using the acquired image. When the user wants toreceive the panorama broadcast service, the receiver may receive thepanorama broadcast service using the information acquired from theadvanced_event_linkage_info( ).

FIG. 39 is a diagram illustrating receiver operation when each receiverdecodes a stream separated and allocated thereto in scenario 1 accordingto an embodiment of the present invention.

Scenario 1 according to an embodiment of the present invention maytransmit a plurality of streams constituting a panoramic image to areceiving end.

A receiver according to an embodiment of the present invention mayinclude a demultiplexer 39010, a decoder 39020 and/or a signalinginformation processor 39030.

The demultiplexer 39010 may receive one of the streams constituting thepanoramic image and/or signaling information, extract the receivedstream and/or signaling information and deliver the extracted streamand/or signaling information to the decoder 39020 and/or the signalinginformation processor 39030.

The decoder may decode the stream transmitted from the demultiplexer togenerate one of images constituting the panoramic image. Here, thedecoder may decode the stream using panorama_composition_informationand/or the signaling information processed by the signaling informationprocessor.

The signaling information processor may process the signalinginformation extracted by the demultiplexer and deliver the processedsignaling information to the decoder. Here, the signaling informationmay include the aforementioned PMT, VCT, EIT and/or SDT.

According to an embodiment of the present invention, each receiver thathas received a divided stream may decode and display the stream. Here,all receivers may become a main receiver and/or sub-receivers.

FIG. 40 is a diagram illustrating receiver operation based on scenario 2according to an embodiment of the present invention.

Scenario 2 according to an embodiment of the present invention mayencode a panoramic image into one stream and deliver the stream to areceiving end.

A receiver according to an embodiment of the present invention mayinclude a demultiplexer 40010, a decoder 40020 and/or a signalinginformation processor (section data processor) 40030.

The demultiplexer may receive the stream constituting the panoramicimage and/or signaling information, extract the received stream and/orsignaling information and deliver the extracted stream and/or signalinginformation to the decoder 40020 and/or the signaling informationprocessor 40030. Here, the demultiplexer may receiveextraction_info_metadata for cropping the panoramic image.

The decoder may decode the stream delivered from the demultiplexer togenerate the panoramic image. Here, the decoder may decode the streamusing the signaling information processed by the signaling informationprocessor. The decoder may crop the panoramic image using the receivedextraction_info_metadata.

The signaling information processor may process the signalinginformation extracted by the demultiplexer and deliver the processedsignaling information to the decoder. Here, the signaling informationmay include the aforementioned PMT, VCT, EIT and/or SDT.

According to an embodiment of the present invention, cropped images(cropped video 1 and cropped video 2) may be delivered to a mainreceiver and/or a sub-receiver through UPnP, HDMI and/or IP.

According to an embodiment of the present invention, a receiver thatreceives the stream constituting the panoramic image may correspond to amain receiver and other receivers may correspond to sub-receivers.

FIG. 41 is a diagram illustrating receiver operation when a mainreceiver decodes all streams and delivers the decoded streams tosub-receivers on the basis of scenario 4 according to an embodiment ofthe present invention.

Scenario 4 according to an embodiment of the present invention mayprovide enhancement data of part of a panoramic image through anenhancement layer using SHVC and provide signaling information thereonfor provision of a high-definition service for an ROI.

A receiver according to an embodiment of the present invention mayinclude a demultiplexer 41010, a first decoder (decoder 1) 41020, asecond decoder (scalable video decoder 2) 41030, a signaling informationprocessor (section data processor) 41040 and/or an ROI filtering unit41050.

The demultiplexer may receive all streams constituting a panoramic imageand/or signaling information, extract the streams and/or the signalinginformation and deliver the extracted streams and/or signalinginformation to the decoders and/or the signaling information processor41040.

The first decoder may decode a base layer stream delivered from thedemultiplexer to generate a base video image (base video). Here, thefirst decoder may decode the base layer stream using ROI_info_metadataand/or the signaling information processed by the signaling informationprocessor.

The second decoder may decode an enhancement layer stream delivered fromthe demultiplexer to generate a high-definition video image. Here, thesecond decoder may receive the base video image signal from the firstdecoder and decode the enhancement layer stream using the received basevideo image signal received and/or the signaling information processedby the signaling information processor.

The signaling information processor may process the signalinginformation extracted by the demultiplexer and deliver the processedsignaling information to the decoders. Here, the signaling informationmay include the aforementioned PMT, VCT, EIT and/or SDT.

The ROI filtering unit may filter an ROI to merge an enhancement layersignal of the ROI with a base layer signal. Here, the ROI filtering unitmay filter the ROI using ROI_filtering_info_descriptor.

According to an embodiment of the present invention, the generatedhigh-definition video image may be delivered to a main receiver and/or asub-receiver through UPnP, HDMI and/or IP. The main receiver may providea high-definition service through PIP.

According to an embodiment of the present invention, a receiver thatreceives and decodes the base layer stream and/or the enhancement layerstream of the panoramic image may correspond to the main receiver and areceiver that receives the high-definition video image from the mainreceiver may correspond to the sub-receiver.

According to an embodiment of the present invention, while the mainreceiver may output the base layer signal and the sub-receiver mayprovide the high-definition service, the main receiver may provide thehigh-definition service and the sub-receiver may output the base layersignal.

Distinguished from the embodiment of the present invention, in which amain receiver decodes all streams constituting a panoramic image,according to another embodiment of the present invention, a sub-receivermay receive and decode the base layer signal, and decode and/or displaythe image of an ROI using a scalable video decoder thereof.

A receiver according to an embodiment of the present invention mayreceive a broadcast stream including a stream with respect to an imageand signaling information about the image (S42010). Here, the signalinginformation may include signaling information about a panoramic image. Ademultiplexer according to an embodiment of the present invention mayextract the stream with respect to the image and the signalinginformation about the image from the received broadcast stream (S42020).A decoder according to an embodiment of the present invention may decodethe stream with respect to the image using the extracted signalinginformation (S42030).

According to another embodiment of the present invention, the signalinginformation about the image may include event connection informationthat indicates information about a panorama broadcast servicecorresponding to a currently viewed broadcast service, and the signalinginformation about the panoramic image may include panorama compositioninformation indicating the composition of the panoramic image, which hasbeen described in detail with reference to FIGS. 17 and 30.

According to another embodiment of the present invention, theaforementioned image may be divided into one or more images, the streamwith respect to the image may include streams with respect to the one ormore divided images, and the decoder may decode the streams with respectto the divided images using the extracted signaling information, whichhas been described in detail with reference to FIGS. 2, 6, 7, 38 and 39.

According to an embodiment of the present invention, the aforementionedbroadcast stream may include a stream with respect to additionalinformation on an ROI of a user, in the image, for providing ahigh-definition image of the ROI, the demultiplexer may extract thestream with respect to the image, the stream with respect to theadditional information on the ROI and the signaling information aboutthe image from the received broadcast stream, and the decoder may decodethe extracted stream with respect to the image and/or the extractedstream with respect to the additional information on the ROI using theextracted signaling information, which has been described with referenceto FIGS. 5, 16 and 41.

According to another embodiment of the present invention, the panoramacomposition information may include information about the dividedimages, which has been described with reference to FIGS. 17, 19 and 20.

According to another embodiment of the present invention, the panoramacomposition information may include filtering information for removingblocking artifacts from the divided images, which has been describedwith reference to FIGS. 17 and 22.

According to another embodiment of the present invention, the panoramacomposition information may include information for cropping thepanoramic image into one or more images, which has been described withreference to FIGS. 3, 8, 17, 23, 38 and 40

According to another embodiment of the present invention, the panoramacomposition information may include information about the image of theaforementioned ROI, which has been described with reference to FIGS. 17,25 and 41.

According to another embodiment of the present invention, the broadcastsignal reception method may include a step of displaying the decodedimage stream and, in the display step, a region shifted according to ascrolling request may be displayed when the scrolling request isreceived from the user, which has been described with reference to FIGS.4, 9 and 10 to 15.

FIG. 43 is a diagram illustrating a configuration of a broadcast signaltransmission apparatus according to an embodiment of the presentinvention.

A broadcast signal transmission apparatus 43050 according to anembodiment of the present invention may include an encoder 43010 forencoding an image, a multiplexer 43020 for multiplexing the encodedimage and signaling information about the image into one broadcaststream, a broadcast signal generator 43030 for generating a broadcastsignal including the multiplexed broadcast stream and/or a transmitter43040 for transmitting the generated broadcast signal. Here, thesignaling information may include signaling information about apanoramic image.

The encoder 43010 according to an embodiment of the present inventionmay encode an image. The multiplexer 43020 according to an embodiment ofthe present invention may multiplex the encoded image and signalinginformation about the image into one broadcast stream. Here, thesignaling information may include signaling information about apanoramic image. The broadcast signal generator 43030 according to anembodiment of the present invention may generate a broadcast signalincluding the multiplexed broadcast stream. The transmitter 43040according to an embodiment of the present invention may transmit thegenerated broadcast signal. Here, the transmitter may transmit thebroadcast signal through a terrestrial broadcast network, the Internetand/or a cable network.

The encoder, the multiplexer, the broadcast signal generator and/or thetransmitter according to an embodiment of the present invention maycorrespond to hardware devices performing the aforementioned operations.That is, the encoder, the multiplexer, the broadcast signal generatorand/or the transmitter according to an embodiment of the presentinvention may correspond to processors that execute instructions storedin a memory.

FIG. 44 is a diagram illustrating a configuration of a broadcast signalreception apparatus according to an embodiment of the present invention.

A broadcast signal reception apparatus 44040 according to an embodimentof the present invention may include a receiver 44010 for receiving abroadcast stream including a stream with respect to an image andsignaling information about the image, a demultiplexer 44020 forextracting the stream with respect to the image and the signalinginformation about the image from the received broadcast stream and/or adecoder 44030 for decoding the extracted stream with respect to theimage using the extracted signaling information.

The receiver 44010 according to an embodiment of the present inventionmay receive a broadcast stream including a stream with respect to animage and signaling information about the image. Here, the signalinginformation may include signaling information about a panoramic image.The demultiplexer 44020 according to an embodiment of the presentinvention may extract the stream with respect to the image and thesignaling information about the image from the received broadcaststream. The decoder 44030 according to an embodiment of the presentinvention may decode the extracted stream with respect to the imageusing the extracted signaling information.

The receiver, the demultiplexer and/or the decoder according to anembodiment of the present invention may correspond to hardware devicesperforming the aforementioned operations. That is, the receiver, thedemultiplexer and/or the decoder according to an embodiment of thepresent invention may correspond to processors that execute instructionsstored in a memory.

While the embodiments have been described with reference to respectivedrawings for convenience, embodiments may be combined to implement a newembodiment. In addition, designing a computer-readable recording mediumstoring programs for implementing the aforementioned embodiments iswithin the scope of the present invention.

The apparatus and method according to the present invention are notlimited to the configurations and methods of the above-describedembodiments and all or some of the embodiments may be selectivelycombined to obtain various modifications.

The image processing methods according to the present invention may beimplemented as processor-readable code stored in a processor-readablerecording medium included in a network device. The processor-readablerecording medium includes all kinds of recording media storing datareadable by a processor. Examples of the processor-readable recordingmedium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk,an optical data storage device and the like, and implementation ascarrier waves such as transmission over the Internet. In addition, theprocessor-readable recording medium may be distributed to computersystems connected through a network, stored and executed as codereadable in a distributed manner.

Although the preferred embodiments of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims. Such modifications should notbe individually understood from the technical spirit or prospect of thepresent invention.

Both apparatus and method inventions are mentioned in this specificationand descriptions of both the apparatus and method inventions may becomplementarily applied to each other.

MODE FOR INVENTION

Various embodiments have been described in the best mode for carryingout the invention.

INDUSTRIAL APPLICABILITY

The present invention is applicable to the broadcast industry.

1-19. (canceled)
 20. A method for transmitting a broadcast signal by anapparatus for transmitting a broadcast signal, comprising: dividing anoriginal first image into two or more images; encoding the dividedimages, wherein the encoded images are carried by respective videostreams; multiplexing the divided images and signaling information forthe original first image and the divided images into a single broadcaststream; and transmitting the broadcast stream, wherein the signalinginformation includes resolution information of the original first image,information indicating a number of video streams carrying the dividedimages and composition information of the original first image, whereinthe composition information of the original first image includesresolution information of the divided images carried by the respectivevideo streams.
 21. The method according to claim 20, wherein thesignaling information further includes an active format descriptionwhich includes start coordinate values of an active portion belonging tothe divided images and the active portion is a partial image of thedivided image to be displayed.
 22. The method according to claim 20,wherein the signaling information about the original first image furtherincludes event connection information indicating information about apanorama broadcast service corresponding to a currently viewed broadcastservice.
 23. The method according to claim 20, wherein the encodingcomprises encoding additional information on a region of interest (ROI)of a user in the original first image, for providing a high-definitionimage of the ROI, and the multiplexing comprises multiplexing theencoded original first image, the signaling information about theoriginal first image and the encoded ROI additional information into asingle broadcast stream.
 24. The method according to claim 20, whereinthe signaling information further includes filtering information forremoving blocking artifacts from the divided images.
 25. The methodaccording to claim 20, wherein the signaling information furtherincludes information for cropping the original first image into one ormore images.
 26. The method according to claim 23, wherein the signalinginformation further includes information about the image of the ROI. 27.A method for receiving a broadcast signal by an apparatus for receivinga broadcast signal, comprising: receiving a broadcast stream includingtwo or more video streams carrying divided images of an original firstimage and signaling information about the original first image and thedivided images; extracting the video streams and the signalinginformation for the original first image and the divided images from thereceived broadcast stream; and decoding the extracted video streamsusing the extracted signaling information, wherein the signalinginformation includes resolution information of the original first image,information indicating a number of video streams carrying the dividedimages and composition information of the original first image, whereinthe composition information of the original first image includesresolution information of the divided images carried by the respectivevideo streams.
 28. The method according to claim 27, wherein thesignaling information further includes an active format descriptionwhich includes start coordinate values of an active portion belonging tothe divided images and the active portion is a partial image of thedivided image to be displayed.
 29. The method according to claim 27,wherein the signaling information about the original first image furtherincludes event connection information indicating information about apanorama broadcast service corresponding to a currently viewed broadcastservice.
 30. The method according to claim 27, wherein the decodingcomprises respectively decoding the video streams using the extractedsignaling information.
 31. The method according to claim 27, wherein thebroadcast stream includes a stream with respect to additionalinformation on an ROI of a user in the original first image, forproviding a high-definition image of the ROI, wherein the extractingcomprises extracting the video streams, the stream with respect to theROI additional information and the signaling information about theoriginal first image and the divided images from the received broadcaststream, and the decoding comprises decoding the extracted video streamsand the extracted stream with respect to the ROI additional informationusing the extracted signaling information.
 32. The method according toclaim 27, wherein the signaling information further includes filteringinformation for removing blocking artifacts from the divided images. 33.The method according to claim 27, wherein the signaling informationfurther includes information for cropping the original first image intoone or more images.
 34. The method according to claim 31, wherein thesignaling information further includes information about the image ofthe ROI.
 35. The method according to claim 27, further comprisingdisplaying the decoded video streams with respect to the image, whereinthe displaying comprises displaying a region shifted according to ascrolling request when the scrolling request is received from a user.36. An apparatus for transmitting a broadcast signal, comprising: anencoder for dividing an original first image into two or more images andencoding the divided images, wherein the encoded images are carried byrespective video streams; a multiplexer for multiplexing the dividedimages and signaling information for the original first image and thedivided images into a single broadcast stream; and a transmitter fortransmitting the broadcast stream, wherein the signaling informationincludes resolution information of the original first image, informationindicating a number of video streams carrying the divided images andcomposition information of the original first image, wherein thecomposition information of the original first image includes resolutioninformation of the divided images carried by the respective videostreams.
 37. An apparatus for receiving a broadcast signal, comprising:a receiver for receiving a broadcast stream including two or more videostreams carrying divided images of an original first image and signalinginformation about the original first image and the divided images; ademultiplexer for extracting the video streams and the signalinginformation for the original first image and the divided images from thereceived broadcast stream; and a decoder for decoding the extractedvideo streams using the extracted signaling information, wherein thesignaling information includes resolution information of the originalfirst image, information indicating a number of video streams carryingthe divided images and composition information of the original firstimage, wherein the composition information of the original first imageincludes resolution information of the divided images carried by therespective video streams.